I found this page because I am seeing the same problem in kubuntu 15.04 Vivid on a Lenovo Thinkpad T60 laptop. The KDE5 plasma-nm (network manager) widget displays "connected" but all network connections are terminated. When selecting "disconnect" in an attempt to reconnect, all wireless networks disappear from the listing.
Wired network continues to work but the systems slows way down. Upon reboot, inspecting the first terminal shows that the system gets spammed with the Apr 30 16:04:10 ********* kernel: [16419.742263] iwl3945 0000:03:00.0: Unable to set up bootstrap uCode: -5 error message as listed above. I speak German but have not yet worked through the link http://forum.ubuntuusers.de/topic/iwlwifi-streckt-die-fluegel-nach-wlan0-failed-/ I guess that's what I'll do next. Upon first inspection, this only seems to provide a temporary workaround rather than a fix. Any help / instructions / workarounds / bug fixes to the kernel/firmware would be greatly appreciated. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1408963 Title: [Xbuntu 14.04, 14.10 and 15.04] Network manager stops working: iwl3945 0000:03:00.0: BSM uCode verification failed at addr ...; wlan0: deauthenticating from... by local choice (Reason: 3=DEAUTH_LEAVING), To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1408963/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
