Network manager can't disconnect from wifi or connect to another wifi

[TyhDyh]

After fresh install 16.04 I can't connect to different wifi network and if netbook lost wifi connection I need reboot it because NM can't do anything to reconnect. NM don't show connected wifi name. I attached image that show this bug.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.2.0-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
Uname: Linux 4.4.0-24-generic i686
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: i386
CRDA:
 country BY: DFS-ETSI
  (2402 - 2482 @ 40), (N/A, 20), (N/A)
  (5170 - 5250 @ 80), (N/A, 20), (N/A)
  (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS
  (5490 - 5710 @ 160), (N/A, 27), (0 ms), DFS
CurrentDesktop: Unity
Date: Sat Jun 11 16:37:25 2016
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2016-05-14 (27 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1)
IpRoute:
 default via 192.168.100.1 dev wlp2s0 proto static metric 600
 169.254.0.0/16 dev wlp2s0 scope link metric 1000
 192.168.100.0/24 dev wlp2s0 proto kernel scope link src 192.168.100.8 metric 600
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-con:
 NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT AUTOCONNECT-PRIORITY READONLY DBUS-PATH ACTIVE DEVICE STATE ACTIVE-PATH
 HUAWEI-KpW2 3a8b63e2-b64e-4e64-b374-4fd453ccf5ec 802-11-wireless 1465652043 Sat 11 Jun 2016 16:34:03 MSK yes 0 no /org/freedesktop/NetworkManager/Settings/1 yes wlp2s0 activated /org/freedesktop/NetworkManager/ActiveConnection/2
 Wired connection 1 32e99c74-fafd-483a-aa6f-745655ff5e9f 802-3-ethernet 1465650077 Sat 11 Jun 2016 16:01:17 MSK yes 4294966297 no /org/freedesktop/NetworkManager/Settings/2 no -- -- --
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 wlp2s0 wifi connected /org/freedesktop/NetworkManager/Devices/2 HUAWEI-KpW2 3a8b63e2-b64e-4e64-b374-4fd453ccf5ec /org/freedesktop/NetworkManager/ActiveConnection/2
 enp1s0 ethernet unavailable /org/freedesktop/NetworkManager/Devices/1 -- -- --
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/0 -- -- --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Aron Xu (happyaron)]

I wonder if you can reproduce this bug in an up-to-date version of 16.04? Can't reproduce here.

[pgf (pgf)]

i just installed xubuntu-16.04.1-desktop-amd64.iso and have seen the same (or slight variation of the same) behavior a few times over the last several days. machine is a thinkpad x220. lshw identifies the networking h/w as:
   - ethernet: 82579LM Gigabit Network Connection
   - wireless: Centrino Advanced-N 6205 [Taylor Peak]

first failure case:
   - connect to wireless network, become active network participant.
   - attach ethernet cable, become active network participant.
   - disconnect ethernet cable.
   - both wired and wireless networks were now in disconnected state, wireless did not reconnect automatically, and there was no list of networks from which to select a connection.

another failure case:
   - use laptop on wireless
   - put to sleep
   - wake laptop
   - same symptoms: both wired and wireless networks were now in disconnected state, wireless did not reconnect automatically, and there was no list of networks from which to select a connection.

this has happened several times, but note that it doesn't happen _every_ time.

when it does occur, there are two workarounds which will cause the laptop to resume normal operation:
    - sudo service NetworkManager restart
or
    - sudo iwlist scan

[pgf (pgf)]

i can't claim it's a dup, but this bug seems likely related to https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1585863

[Launchpad Janitor (janitor)]

[Expired for network-manager (Ubuntu) because there has been no activity for 60 days.]