> Is there perhaps a bug in the update of the
> network manager?

Possibly. Run

$ apt policy network manager

And see if the "Installed:" field says "1.10.6-2ubuntu1+8.0trisquel1" to
confirm that you received the update I think you received.

This is a recent change so prevent network-manager from disclosing your
hostname to the router, which was deemed a privacy issue.

If you have not rebooted since updating, try doing so. If that doesn't
help, or if you have already rebooted, try installing the old version
of network-manager and see if that fixes the problem.

$ sudo apt install network-manager=1.2.6-0ubuntu0.16.04.3

Unless you have run "apt clean" since upgrading, the previous version of
network-manager should still be cached, so you should not need to be
connected to the internet to reinstall.

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