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[Andreas <1408963@xxxxxxxxxxxxxxxxxx>]

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.

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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

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