NetworkManager-wait-online.service fails and prevents Internet connection

After updating my system and rebooting the NetworkManager-wait-online.service fails and prehibts my system from accessing the Internet.

I am not able to upgrade again (as I have no Internet)

Even switching to an older kernel version in the grub boot menu did not help.

I have verified the connection is not the problem by plugging the LAN cable into a alternative laptop - which worked fine.

How can I fix this problem?
As this is a production work machine a fix would be urgent. Thank you!

(I have attached a picture from gnome logs, I am sorry for the picture quality)

Answer:

It seemed to be a hardware level problem.

I cleaned my mainboard and the ethernet port and it worked aftwards.

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