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 Desktop Packages, which is subscribed to network-manager in 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), Status in linux-firmware package in Ubuntu: Confirmed Status in network-manager package in Ubuntu: Confirmed Bug description: From time to time, the system loses all wireles networks and kubuntu network manager applet goes blank - not even one network is shown. All wifi connections are broken. Rebooting fixes the issue, switching to WICD on-the-fly enables to continue browsing without rebooting, so it seems to be no hardware issue or iwl3945 issue. What to expect: stable connections and flawless network managing. What happens: so above. Further informations about the system, the network configuration, the package version can be found in the attachment, also parts of rsyslog and dmesg. Interesting, according to some helpers, are the following lines: dmesg: wlan0: deauthenticating from 02:26:4d:ac:8f:45 by local choice (Reason: 3=DEAUTH_LEAVING) lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.10 Release: 14.10 Codename: utopic apt-cache policy network-manager network-manager: Installiert: 0.9.8.8-0ubuntu28 Installationskandidat: 0.9.8.8-0ubuntu28 Versionstabelle: *** 0.9.8.8-0ubuntu28 0 500 http://de.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages 100 /var/lib/dpkg/status To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1408963/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
