Just installed Ubuntu 12.04 a couple of weeks ago on my HP laptop (completely replaced Windows). Everything seemed fine until a few days ago when I was unable to connect to the internet with my wireless network at home. I also tried three other wireless networks and also tried to connect by ethernet cable. These are all networks that I have been able to connect to in the past with no problems. In each case it says that I am connected to the network, but when I open Firefox I get the message "Firefox can't find server at start.ubuntu.com". I also tried Google Chrome and that didn't work either.
However, there is one network that I can connect to; the secure network at my school. The first time I noticed this problem was after I installed some updates at school and then went home and couldn't connect. I'm not sure if it had anything to do with these updates or if that's just a coincidence. When I came back to school it was fine and then it stopped working again went I went home.
Here's what I get for the following commands that phipsalabim suggested:
~$ lspci -v | grep -iA 7 network 02:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000 Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN Flags: bus master, fast devsel, latency 0, IRQ 44 Memory at d2500000 (64-bit, non-prefetchable) [size=8K] Capabilities: <access denied> Kernel driver in use: iwlwifi Kernel modules: iwlwifi ~$ iwconfig lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:"My School Secure" Mode:Managed Frequency:2.437 GHz Access Point: DC:7B:94:87:AE:E1 Bit Rate=65 Mb/s Tx-Power=14 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=52/70 Signal level=-58 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:3300 Invalid misc:570 Missed beacon:0 eth0 no wireless extensions.
Note that I'm at my school where I do have access.
~$ rfkill list all 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: no ~$ lsmod Module Size Used by snd_hda_codec_hdmi 32474 1 snd_hda_codec_idt 70795 1 bnep 18281 2 rfcomm 47604 0 bluetooth 180153 10 bnep,rfcomm parport_pc 32866 0 ppdev 17113 0 binfmt_misc 17540 1 snd_hda_intel 33773 5 snd_hda_codec 127706 3 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel snd_hwdep 17764 1 snd_hda_codec snd_pcm 97275 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec i915 477611 3 drm_kms_helper 46978 1 i915 snd_seq_midi 13324 0 snd_rawmidi 30748 1 snd_seq_midi snd_seq_midi_event 14899 1 snd_seq_midi arc4 12529 2 drm 241971 4 i915,drm_kms_helper snd_seq 61929 2 snd_seq_midi,snd_seq_midi_event uvcvideo 72627 0 videodev 98259 1 uvcvideo snd_timer 29990 2 snd_pcm,snd_seq hp_wmi 18092 0 joydev 17693 0 sparse_keymap 13890 1 hp_wmi snd_seq_device 14540 3 snd_seq_midi,snd_rawmidi,snd_seq v4l2_compat_ioctl32 17128 1 videodev hp_accel 25976 0 psmouse 97485 0 wmi 19256 1 hp_wmi lis3lv02d 19876 1 hp_accel i2c_algo_bit 13423 1 i915 video 19651 1 i915 iwlwifi 401140 0 mac_hid 13253 0 wacom 53300 0 serio_raw 13211 0 input_polldev 13896 1 lis3lv02d lp 17799 0 mac80211 506862 1 iwlwifi snd 79041 19 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_ra wmidi,snd_seq,snd_timer,snd_seq_device cfg80211 205774 2 iwlwifi,mac80211 soundcore 15091 1 snd snd_page_alloc 18529 2 snd_hda_intel,snd_pcm parport 46562 3 parport_pc,ppdev,lp hid_logitech_dj 18730 0 ums_realtek 18248 0 usbhid 47238 1 hid_logitech_dj hid 99636 2 hid_logitech_dj,usbhid r8169 62154 0 usb_storage 49198 1 ums_realtek
And for the wired connection.
~$ lspci -v | grep -iA 10 ethernet 01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02) Subsystem: Hewlett-Packard Company Device 3662 Flags: bus master, fast devsel, latency 0, IRQ 43 I/O ports at 2000 [size=256] Memory at d0410000 (64-bit, prefetchable) [size=4K] Memory at d0400000 (64-bit, prefetchable) [size=64K] Expansion ROM at d0420000 [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: r8169 Kernel modules: r8169