Update: I have recently talked with previous owner of this laptop. He had bougth couple of identical Thinkpads. All were running Ubuntu, but mine was the only one having WiFi issues. So I'm almost sure, that it's broken WLAN card. Few days ago I've got an replacement part, but it turned out to not be identical to original. And now I'm battling Lenovo part whitelisting scam.
Since I've found an answer, I'm marking this thread as solved.
But thank you for your reply @Aki

Since I've found an answer, I'm marking this thread as solved.
But thank you for your reply @Aki
Statistics: Posted by dashek — 2024-02-17 13:31