I don't claim to have the detailed answer to this bug, but I can tell you who (what) does...the package wifi-radar. I saw this failure on 3 out of 3 laptops (running a prism2, a Cisco 350 PCMCIA, and Intel Pro/wl 2100). In each case, configuration via wifi-radar solved the problem. Hopefully, this will provide a workaround for users and a pointer for the developers as to where the problem might be.
-- [network-admin] ipw2200/Intel 2915abg Wireless 128-bit WEP doesn't work, must set up manually https://launchpad.net/bugs/67876 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
