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Ubuntu Server 12.04 is installed on my desktop system (in text-mode, no X-Window is available) and I have no wired Ethernet connected, just wireless network is available. I use TP-Link TL-WN723N USB wireless adapter to connect to wireless network.

At first, tried to use iwconfig to connect, but found that it could not be used to connect to a WPA2 secured network! At fisrt, iwconfig shows:

lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
          Power Management:off

and sudo iwlist wlan0 scanning shows:

wlan0   Interface doesn't support scanning : Network is down

after running sudo ifconfig wlan0 up, sudo iwlist wlan0 scanning shows:

wlan0     Scan completed :
          Cell 01 - Address: OO:OO:OO:OO:OO:OO
                    Channel:1
                    Frequency:2.412 GHz (Channel 1)
                    Quality=66/70  Signal level=-44 dBm  
                    Encryption key:on
                    ESSID:"MYESSID12345"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=0000000789abcdef
                    Extra: Last beacon: 32ms ago
                    IE: Unknown: 000123456789ABCEDF0123456789
                    IE: Unknown: 0123456789ABCDEF0123
                    IE: Unknown: 012345
                    IE: Unknown: ABCEDF
                    IE: Unknown: 0123456789AB
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (1) : TKIP
                        Authentication Suites (1) : PSK

I installed wpasupplicant to connect to wireless network secured with WPA2. But there are some problems using this package:

I tried following instructions in This answer

wpa_passphrase 'MYESSID12345' 'MYPASSWORD$1234567' > CONFIG_FILE

after above command, I edited CONFIG_FILE (/etc/wpa_supplicant/wpa_supplicant.conf) so it contains:

network={
    ssid="MYESSID12345"
    scan_ssid=1
    key_mgmt=WPA-PSK
    psk="MYPASSWORD$1234567"
    proto=RSN WPA
    pairwise=CCMP TKIP
    group=CCMP TKIP
    #psk=1234567890abcdef1234567890abcdef1234567890abcedf1234567890abcdef
}

Next i run wpa_supplicant -iwlan0 -c/etc/wpa_supplicant.conf -Dwext -dd. The result is following errors on stderr:

ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument

and stdout is:

Initializing interface 'wlan0' conf '/etc/wpa_supplicant/wpa_supplicant.conf' driver 'wext' ctrl_interface 'N/A' bridge 'N/A'
Configuration file '/etc/wpa_supplicant/wpa_supplicant.conf' -> '/etc/wpa_supplicant/wpa_supplicant.conf'
Reading configuration file '/etc/wpa_supplicant/wpa_supplicant.conf'
Line: 1 - start of a new network block
ssid - hexdump_ascii(len=12):
     01 23 45 67 89 ab cd ef 01 23 45 67               MYESSID12345
scan_ssid=1 (0x1)
key_mgmt: 0x2
PSK (ASCII passphrase) - hexdump_ascii(len=18): [REMOVED]
proto: 0x3
pairwise: 0x18
group: 0x18
PSK (from passphrase) - hexdump(len=32): [REMOVED]
Priority group 0
   id=0 ssid='MYESSID12345'
WEXT: cfg80211-based driver detected
SIOCGIWRANGE: WE(compiled)=22 WE(source)=21 enc_capa=0xf
  capabilities: key_mgmt 0xf enc 0xf flags 0x0
netlink: Operstate: linkmode=1, operstate=5
Own MAC address: mm:mm:mm:mm:mm:mm
wpa_driver_wext_set_key: alg=0 key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=4 set_tx=0 seq_len=0 key_len=0
Driver did not support SIOCSIWENCODEEXT
wpa_driver_wext_set_key: alg=0 key_idx=5 set_tx=0 seq_len=0 key_len=0
Driver did not support SIOCSIWENCODEEXT
wpa_driver_wext_set_countermeasures
RSN: flushing PMKID list in the driver
Setting scan request: 0 sec 100000 usec
WPS: UUID based on MAC address - hexdump(len=16): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
EAPOL: SUPP_PAE entering state DISCONNECTED
EAPOL: Supplicant port status: Unauthorized
EAPOL: KEY_RX entering state NO_KEY_RECEIVE
EAPOL: SUPP_BE entering state INITIALIZE
EAP: EAP entering state DISABLED
EAPOL: Supplicant port status: Unauthorized
EAPOL: Supplicant port status: Unauthorized
Added interface wlan0
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b06 len=8
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b1a len=8
State: DISCONNECTED -> SCANNING
Scan SSID - hexdump_ascii(len=12):
     01 23 45 67 89 ab cd ef 01 23 45 67               MYESSID12345    
Starting AP scan for specific SSID(s)
Scan requested (ret=0) - scan timeout 5 seconds
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b19 len=8
Received 656 bytes of scan results (2 BSSes)
BSS: Start scan result update 1
BSS: Add new id 0 BSSID OO:OO:OO:OO:OO:OO SSID 'MYESSID12345'
BSS: Add new id 1 BSSID 11:11:11:11:11:11 SSID 'OTHER1'
New scan results available
Selecting BSS from priority group 0
Try to find WPA-enabled AP
0: OO:OO:OO:OO:OO:OO ssid='MYESSID12345' wpa_ie_len=0 rsn_ie_len=20 caps=0x11
   selected based on RSN IE
   selected WPA AP OO:OO:OO:OO:OO:OO ssid='MYESSID12345'
Request association: reassociate: 0  selected: OO:OO:OO:OO:OO:OO  bssid: 00:00:00:00:00:00  pending: 00:00:00:00:00:00  wpa_state: SCANNING
Trying to associate with OO:OO:OO:OO:OO:OO (SSID='MYESSID12345' freq=2412 MHz)
FT: Stored MDIE and FTIE from (Re)Association Response - hexdump(len=0):
Cancelling scan request
WPA: clearing own WPA/RSN IE
Automatic auth_alg selection: 0x1
RSN: PMKSA cache search - network_ctx=(nil) try_opportunistic=1
RSN: Search for BSSID OO:OO:OO:OO:OO:OO
RSN: Consider OO:OO:OO:OO:OO:OO for OKC
RSN: No PMKSA cache entry found
RSN: using IEEE 802.11i/D9.0
WPA: Selected cipher suites: group 8 pairwise 8 key_mgmt 2 proto 2
WPA: clearing AP WPA IE
WPA: set AP RSN IE - hexdump(len=22): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab
WPA: using GTK TKIP
WPA: using PTK TKIP
WPA: using KEY_MGMT WPA-PSK
WPA: not using MGMT group cipher
WPA: Set own WPA IE default - hexdump(len=22): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab
No keys have been configured - skip key clearing
State: SCANNING -> ASSOCIATING
wpa_driver_wext_set_operstate: operstatioctl[SIOCSIWFREQ]: Device or resource busy
e 0->0 (DORMANT)
netlink: Operstate: linkmode=-1, operstate=5
wpa_driver_wext_associate
wpa_driver_wext_set_drop_unencrypted
wpa_driver_wext_set_psk
Association request to the driver failed
Setting authentication timeout: 10 sec 0 usec
EAPOL: External notification - EAP success=0
EAPOL: Supplicant port status: Unauthorized
EAPOL: External notification - EAP fail=0
EAPOL: Supplicant port status: Unauthorized
EAPOL: External notification - portControl=Auto
EAPOL: Supplicant port status: Unauthorized
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b1a len=8
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b06 len=8
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b1a len=20
RTM_NEWLINK: operstate=0 ifi_flags=0x11003 ([UP][LOWER_UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
RTM_NEWLINK: operstate=0 ifi_flags=0x11003 ([UP][LOWER_UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8c08 len=24
AssocResp IE wireless event - hexdump(len=16): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
RTM_NEWLINK: operstate=0 ifi_flags=0x11003 ([UP][LOWER_UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b15 len=20
Wireless event: new AP: OO:OO:OO:OO:OO:OO
Association info event
resp_ies - hexdump(len=16): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
FT: Stored MDIE and FTIE from (Re)Association Response - hexdump(len=0):
State: ASSOCIATING -> ASSOCIATED
wpa_driver_wext_set_operstate: operstate 0->0 (DORMANT)
netlink: Operstate: linkmode=-1, operstate=5
Associated to a new BSS: BSSID=OO:OO:OO:OO:OO:OO
No keys have been configured - skip key clearing
Associated with OO:OO:OO:OO:OO:OO
WPA: Association event - clear replay counter
RSN: PMKSA cache search - network_ctx=0x9c8e950 try_opportunistic=0
RSN: Search for BSSID OO:OO:OO:OO:OO:OO
RSN: No PMKSA cache entry found
WPA: Clear old PTK
EAPOL: External notification - portEnabled=0
EAPOL: Supplicant port status: Unauthorized
EAPOL: External notification - portValid=0
EAPOL: Supplicant port status: Unauthorized
EAPOL: External notification - EAP success=0
EAPOL: Supplicant port status: Unauthorized
EAPOL: External notification - portEnabled=1
EAPOL: SUPP_PAE entering state CONNECTING
EAPOL: SUPP_BE entering state IDLE
Setting authentication timeout: 10 sec 0 usec
Cancelling scan request
RX EAPOL from OO:OO:OO:OO:OO:OO
RX EAPOL - hexdump(len=99): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Setting authentication timeout: 10 sec 0 usec
IEEE 802.1X RX: version=1 type=3 length=95
  EAPOL-Key type=2
  key_info 0x89 (ver=1 keyidx=0 rsvd=0 Pairwise Ack)
  key_length=32 key_data_length=0
  replay_counter - hexdump(len=8): 00 00 00 00 00 00 00 01
  key_nonce - hexdump(len=32): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
  key_iv - hexdump(len=16): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  key_rsc - hexdump(len=8): 00 00 00 00 00 00 00 00
  key_id (reserved) - hexdump(len=8): 00 00 00 00 00 00 00 00
  key_mic - hexdump(len=16): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
WPA: RX EAPOL-Key - hexdump(len=99): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
State: ASSOCIATED -> 4WAY_HANDSHAKE
WPA: RX message 1 of 4-Way Handshake from OO:OO:OO:OO:OO:OO (ver=1)
RSN: msg 1/4 key data - hexdump(len=0):
WPA: Renewed SNonce - hexdump(len=32): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
WPA: PTK derivation - A1=mm:mm:mm:mm:mm:mm A2=OO:OO:OO:OO:OO:OO
WPA: PMK - hexdump(len=32): [REMOVED]
WPA: PTK - hexdump(len=64): [REMOVED]
WPA: WPA IE for msg 2/4 - hexdump(len=22): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab
WPA: Sending EAPOL-Key 2/4
WPA: TX EAPOL-Key - hexdump(len=121): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 00 00 00 00 00 00 00 00
RX EAPOL from OO:OO:OO:OO:OO:OO
RX EAPOL - hexdump(len=161): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 00 00 00 00 00 00 00 00 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
IEEE 802.1X RX: version=1 type=3 length=157
  EAPOL-Key type=2
  key_info 0x13c9 (ver=1 keyidx=0 rsvd=0 Pairwise Install Ack MIC Secure Encr)
  key_length=32 key_data_length=62
  replay_counter - hexdump(len=8): 00 00 00 00 00 00 00 02
  key_nonce - hexdump(len=32): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
  key_iv - hexdump(len=16): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
  key_rsc - hexdump(len=8): 00 00 00 00 00 00 00 00
  key_id (reserved) - hexdump(len=8): 00 00 00 00 00 00 00 00
  key_mic - hexdump(len=16): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
WPA: RX EAPOL-Key - hexdump(len=161): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 00 00 00 00 00 00 00 00 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef
RSN: encrypted key data - hexdump(len=62): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab
WPA: decrypted EAPOL-Key key data - hexdump(len=62): [REMOVED]
State: 4WAY_HANDSHAKE -> 4WAY_HANDSHAKE
WPA: RX message 3 of 4-Way Handshake from OO:OO:OO:OO:OO:OO (ver=1)
WPA: IE KeyData - hexdump(len=62): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab
WPA: RSN IE in EAPOL-Key - hexdump(len=22): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab
WPA: GTK in EAPOL-Key - hexdump(len=40): [REMOVED]
WPA: Sending EAPOL-Key 4/4
WPA: TX EAPOL-Key - hexdump(len=99): 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 01 23 45 67 89 ab cd ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
WPA: Installing PTK to the driver.
wpa_driver_wext_set_key: alg=2 key_idx=0 set_tx=1 seq_len=6 key_len=32
EAPOL: External notification - portValid=1
State: 4WAY_HANDSHAKE -> GROUP_HANDSHAKE
RSN: received GTK in pairwise handshake - hexdump(len=34): [REMOVED]
WPA: Group Key - hexdump(len=32): [REMOVED]
WPA: Installing GTK to the driver (keyidx=1 tx=0 len=32).
WPA: RSC - hexdump(len=6): 00 00 00 00 00 00
wpa_driver_wext_set_key: alg=2 key_idx=1 set_tx=0 seq_len=6 key_len=32
WPA: Key negotiation completed with OO:OO:OO:O:OO:OO [PTK=TKIP GTK=TKIP]
Cancelling authentication timeout
State: GROUP_HANDSHAKE -> COMPLETED
CTRL-EVENT-CONNECTED - Connection to OO:OO:OO:OO:OO:OO completed (auth) [id=0 id_str=]
wpa_driver_wext_set_operstate: operstate 0->1 (UP)
netlink: Operstate: linkmode=-1, operstate=6
EAPOL: External notification - portValid=1
EAPOL: External notification - EAP success=1
EAPOL: SUPP_PAE entering state AUTHENTICATING
EAPOL: SUPP_BE entering state SUCCESS
EAP: EAP entering state DISABLED
EAPOL: SUPP_PAE entering state AUTHENTICATED
EAPOL: Supplicant port status: Authorized
EAPOL: SUPP_BE entering state IDLE
EAPOL authentication completed successfully
RTM_NEWLINK: operstate=1 ifi_flags=0x11043 ([UP][RUNNING][LOWER_UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
EAPOL: startWhen --> 0
EAPOL: disable timer tick
CTRL-EVENT-TERMINATING - signal 2 received
Removing interface wlan0
wpa_driver_wext_deauthenticate
wpa_driver_wext_set_key: alg=0 key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=4 set_tx=0 seq_len=0 key_len=0
Driver did not support SIOCSIWENCODEEXT
wpa_driver_wext_set_key: alg=0 key_idx=5 set_tx=0 seq_len=0 key_len=0
Driver did not support SIOCSIWENCODEEXT
wpa_driver_wext_set_key: alg=0 key_idx=0 set_tx=0 seq_len=0 key_len=0
State: COMPLETED -> DISCONNECTED
wpa_driver_wext_set_operstate: operstate 1->0 (DORMANT)
netlink: Operstate: linkmode=-1, operstate=5
EAPOL: External notification - portEnabled=0
EAPOL: SUPP_PAE entering state DISCONNECTED
EAPOL: Supplicant port status: Unauthorized
EAPOL: SUPP_BE entering state INITIALIZE
EAPOL: Supplicant port status: Unauthorized
EAPOL: External notification - portValid=0
EAPOL: Supplicant port status: Unauthorized
EAPOL: External notification - EAP success=0
EAPOL: Supplicant port status: Unauthorized
wpa_driver_wext_set_countermeasures
No keys have been configured - skip key clearing
BSS: Remove id 0 BSSID OO:OO:OO:OO:OO:OO SSID 'MYESSID12345'
BSS: Add new id 1 BSSID 11:11:11:11:11:11 SSID 'OTHER1'
Cancelling scan request
Cancelling authentication timeout
netlink: Operstate: linkmode=0, operstate=6

after the last command, wlan0 goes DOWN and I have to make it up using sudo iwconfig wlan0 up command again. Also I tried removing network-manager package based on a comment saying this may solve the problem, but no success.

Also tried to edit wpa_supplicant.conf1 file as follows:

TRY #1 for wpa_supplicant.conf

network={
    ssid="MYESSID12345"
    #psk="MYPASSWORD$1234567"
    psk=1234567890abcdef1234567890abcdef1234567890abcedf1234567890abcdef
}

TRY #2 for wpa_supplicant.conf

network={
    ssid="MYESSID12345"
    scan_ssid=1
    key_mgmt=WPA-PSK
    #psk="MYPASSWORD$1234567"
    proto=RSN WPA
    pairwise=CCMP TKIP
    group=CCMP TKIP
    psk=1234567890abcdef1234567890abcdef1234567890abcedf1234567890abcdef
}
  • Could you try to connect with nl80211 driver? Use 'wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant.conf -D nl80211' command. Also, did you install firmware for this driver? – numand Jul 26 '15 at 10:46
  • I tried removing #psk="MYPASSWORD$1234567" from my wpa_supplicant.conf file (TRY#1) and the problem has solved (wpa_supplicant connected to my AP and after running sudo dhclient wlan0 I could access Internet). After that I recreated the CONFIG_FILE using wpa_passphrase 'MYESSID12345' 'MYPASSWORD$1234567' > CONFIG_FILE command and it creates a new CONFIG_FILE same as TRY #1 and the problem did not occurred again! – PHP Learner Jul 28 '15 at 7:31
12

First of all, I think you'll have better luck if your router is set to use WPA2-AES and not TKIP.

Second, I believe you are taking the long, complicated route when the short, easy route would work perfectly well. First, I suggest you back up your current wpa_supplicant.conf file:

sudo mv /etc/wpa_supplicant/wpa_supplicant.conf  /etc/wpa_supplicant/wpa_supplicant.bak

Next, I suggest you edit /etc/network/interfaces:

auto lo
iface lo inet loopback

auto wlan0
iface wlan0 inet static
address 192.168.1.150
netmask 255.255.255.0
gateway 192.168.1.1
wpa-essid MYESSID12345
wpa-psk MYPASSWORD$1234567

Of course, substitute your details here. Restart the interface:

sudo ifdown wlan0 && sudo ifup -v wlan0

Test:

ping -c3 www.ubuntu.com

If you get ping results, you are connected.

  • The problem with this approach though, is that in bypassing wpa_supplicant your PC won't reconnect to the wifi if connection is lost. – pospi Sep 23 '16 at 5:47
  • thanks so much... i wasted one day but when i applied your answer it worked... – arn-arn Apr 20 '17 at 16:54
  • Can I copy your address netmask and gateway values? If not what do I put in there? – lightsout Dec 22 '17 at 22:02
  • @lightsout I think this a complex question and I recommend that you start your own. I’ll be happy to help. – chili555 Dec 22 '17 at 22:21
  • Or you can reboot. I think the 'down' part can safely be ignored. Did the 'up' part seen to connect? – chili555 Dec 22 '17 at 23:38

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