I can confirm this bug. I believe it has something to do with us having Broadcom network controllers. I managed to find this on Launchpad by Googling for "knetworkmanager disconnected first time" and immediately noticed we both used Broadcom's.
0b:00.0 Network controller [0280]: Broadcom Corporation BCM94311MCG wlan mini-PCI [14e4:4311] (rev 01) Subsystem: Dell Unknown device [1028:0007] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 17 Region 0: Memory at fe8fc000 (32-bit, non-prefetchable) [size=16K] Capabilities: <access denied> -- Knetworkmanager loose wireless connection, Networkmanager crashing https://bugs.launchpad.net/bugs/159949 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs