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
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https://bugs.launchpad.net/bugs/1591515
Title:
Network manager can't disconnect from wifi or connect to another wifi
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