The questionmark on the wifi icon means that a known Wifi network is detected but no connection is established. Did you enter the right credentials to connect to the network?
– noisefloorNov 20 '23 at 12:43
Look at the network logs with the terminal command: sudo journalctl -b 0 -u NetworkManager. Read man journalctl NetworkManager service. Also do: service NetworkManager status and service --status-all.
– waltinatorNov 20 '23 at 16:04
Hawing the same problem on ThinkPad T440p. It's connected, have IP address but can't ping even a router.
– Антон СергуновDec 17 '23 at 14:48
sudo journalctl -b 0 -u NetworkManager. Readman journalctl NetworkManager service. Also do:service NetworkManager statusandservice --status-all. – waltinator Nov 20 '23 at 16:04