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I'm an absolute beginner as an [L]Ubuntu user. The fact is my laptop can find any wifi network, but when I insert the password (which is absolutely right, I assure) it asks again for the password few seconds later and it keeps asking and asking and asking...

BTW I'm using this same laptop now, but with an wired network.

I have another computer, a desktop, with Ubuntu using the same wifi network. I've already tried to restart my router and any device. What else could I check?

This is what I have here:

01:03.0 Network controller: Intel Corporation PRO/Wireless LAN 2100 3B Mini PCI Adapter (rev 04)  
Subsystem: Intel Corporation Device 2565
Flags: bus master, medium devsel, latency 32, IRQ 5
    Memory at fcfee000 (32-bit, non-prefetchable) [size=4K]
    Capabilities: [dc] Power Management version 2
    Kernel driver in use: ipw2100
    Kernel modules: ipw2100

$ dmesg | grep ipw210

[ 20.552763] ipw2100: Intel(R) PRO/Wireless 2100 Network Driver, git-1.2.2 
[ 20.552768] ipw2100: Copyright(c) 2003-2006 Intel Corporation 
[ 20.552930] ipw2100 0000:01:03.0: PCI INT A -> Link[LNKB] -> GSI 5 (level, low) -> IRQ 5 [ 20.553507] ipw2100: Detected Intel PRO/Wireless 2100 Network Connection 

sudo iwlist scan

Cell 03 - Address: bla bla 
Protocol:IEEE 802.11bg 
Frequency:2.437 GHz (Channel 6) 
Encryption key:on Bit Rates bla bla bla bla bla bla 
Signal level:0 
Noise level:0 
IE: WPA Version 1 
Group Cipher : TKIP 
Pairwise Ciphers (2) : TKIP CCMP 
Authentication Suites (1) : PSK 
IE: IEEE 802.11i/WPA2 Version 1 
Group Cipher : TKIP 
Pairwise Ciphers (2) : TKIP CCMP 
Authentication Suites (1) : PSK 
Extra: Last beacon: 24ms ago
share|improve this question
@VictorF Which encryption are you using? – Symin Feb 1 '13 at 18:00
Sorry, are you talking about password encryption? Partition encryption? – VictorF Feb 1 '13 at 18:06
@VictorF encryption for your authentication type. WPA2 uses tkip or aes. – Symin Feb 1 '13 at 18:09
So, WPA2 using TKIP. Is it a problem? – VictorF Feb 1 '13 at 18:31
Can you edit your answer and add output of dmesg | grep ieee80211 and dmesg | grep ipw2100? – Symin Feb 2 '13 at 11:55
up vote 0 down vote accepted

From your iwlist scan I can see that your router is set-up to use both TKIP and AES encryptions. I had similar problem before with one of my network cards (it was supposed to support both encryption methods) and the solution was to configure my router to use only TKIP.

share|improve this answer
For now, I simple disabled my security, and it works... unsafely :( – VictorF Mar 27 '13 at 2:52
Firstly I removed any authentication and it works perfectly. As we can't keep a unprotected network, we set the following: SSID: My Network Channel: 3 Security: WEP Key Size: 128 bit Authentication Type: Open System key 1: blabla1 key 2: blabla2 key 3: blabla3 key 4: blabla4 Well, WEP is a less protected standard, then the modem recommends that the keys should be changed frequently and requests 4 different keys. – VictorF Apr 30 '13 at 15:13

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