Just to confirm that I had the bug (see attached syslog), I recompiled the network-manager package with Emanuel Steen debdiff, and it solves the problem for me too (Dell Lattitude D830, Broadcom b43 wireless card)
** Attachment added: "syslog" http://launchpadlibrarian.net/12816818/syslog -- NM can't use wireless networks https://bugs.launchpad.net/bugs/204868 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs