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Since a few days (I guess caused by some recent update) I have a problem with my wifi connection on Ubuntu 12.04.

I see all the wifi networks and can connect successfully. The wifi works perfectly fine for like one day. Then all of a sudden (maybe caused by the update manager?) my wifi disappears. It is not listed as available anymore. I also cannot connect to it manually (as a hidden network) and it does not appear if I run iwlist scan. All other wifi networks are still there and I can connect to them.

What works though is change the SSID of my Network. I can then connect again under the new SSID. But again after one day or so it disappears and I have to change the SSID again.

This is very anoying.

Not only don't I know how to solve the problem. I do not even know where to start searching for the cause. I.e. which logfiles should I check? What can I try to debug? I will happily provide you with any information about my system. Just tell me where to start.

Thanks for any helpful advice.

EDIT: So this is the output of lshw -class network:

   description: Wireless interface
   product: BCM4312 802.11b/g LP-PHY
   vendor: Broadcom Corporation
   physical id: 0
   bus info: pci@0000:0c:00.0
   logical name: eth1
   version: 01
   serial: 00:16:44:f0:43:fd
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
   configuration: broadcast=yes driver=wl0 driverversion=6.20.155.1 (r326264) latency=0 multicast=yes wireless=IEEE 802.11abg
   resources: irq:17 memory:f6cfc000-f6cfffff

The dmesg logfile is here: https://www.dropbox.com/s/3ohtabodt7i00f8/dmesg.txt

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Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. –  Danatela Mar 11 at 9:48

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