After trying many different things as switching between WPA-only, WPA2-only, WPA-WPA2-mixed, disabling UPnP and WPS, and downgrading to Ubuntu 12.04 I still had this problem. Then I tried another router - and everything works fine now, with WPA-mixed mode and Ubuntu 12.10, so luckily for me this problem is solved. If it helps anyone, the problematic router was Belkin Basic Wireless Router F7D1301 v1 and the working one is Sitecom WL-160.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1070455 Title: Wireless disconnects repeatedly. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/wpasupplicant/+bug/1070455/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs