Ubuntu
gnome-shell package

  1. Bug #1725362
  2. Comment #5

Comment 5 for bug 1725362

Revision history for this message
ed20900 (ed20900) wrote :

I am on Ubuntu 18.04 LTS.

This happens to me from time to time. If I reset the router the question mark disappears.
Check that the DHCP table has no conflicts. Or that your router is not hung.