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I have a problem with connection icon. Even if I not connected to any network icon is showing as connected, this two opposite arrows. enter image description here

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    That is an annoying bug that has been around for a while. You can make it show the correct thing by running sudo systemctl restart NetworkManager to restart Network Manager.
    – edwinksl
    Sep 16 '16 at 8:10
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This is a fairly old bug that is more annoying than harmful, and there is a bug report for this at https://bugs.launchpad.net/ubuntu/+source/indicator-applet/+bug/1575655. The workaround is to restart Network Manager by running:

sudo systemctl restart NetworkManager

If you want to bring this bug to the developers' attention, please visit the bug report that I linked and click on "Yes, it affects me".

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    I marked this bug report as "affect me".
    – QkiZ
    Sep 19 '16 at 12:55
  • This trick doesn't work for me in Ubuntu 16.10.
    – QkiZ
    Oct 18 '16 at 18:02
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One reason for this behavior of NetworkManager (applet) might be that some kind of virtualization software is installed (e.g. qemu/kvm or VirtualBox). If this is the case NetworkManager handles the virtual interfaces as wired networks instead of ignoring them.

As a workaround you could force NM to ignore these interfaces by adding this to /etc/NetworkManager/NetworkManager.conf:

[keyfile]
unmanaged-devices=interface-name:virbr*,interface-name:vboxnet*
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Problem was in virbr0 interface which is always connected and ethernet type. To ignore this interface I added the following lines to /etc/NetworkManager/NetworkManager.conf:

[keyfile]
unmanaged-devices=mac:00:00:00:00:00:00

After restart Network Manager service icon is displayed properly.

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