I have seen the recommendation of X1, I can second that, with addition of x280. The serviceability is great, Google “thinkpad x280 hardware service manual” giv

I have seen the recommendation of X1, I can second that, with addition of x280. The serviceability is great, Google “thinkpad x280 hardware service manual” gives excellent doc, from the vendor ! (In fairness the same true for most thinkpads I think). I got a used X280 - very happy running Ubuntu on it. But the exact model I got had a bit bleak LCD screen and 8GB ram - via AliExpress I first upgraded the screen to bright IPS FHD screen (replacement part cost ~60 euro, half an hour and no tools needed to replace); Then I got brave and got a 16GB RAM motherboard (vs the 8GB that it had). Was about 400 euro, and also relatively easy, though required a bit of gentle disassembly. And then I wondered “rather than throwing away the old parts, how hard would it be to get all the missing bits and build yet another x280 laptop from scratch ?” - I grabbed the hardware manual and went shopping… I think the overall list turned out about 250-300 euro. Still awaiting for some bits, but based on my motherboard replacement experience the assembly shouldn’t be a big deal of a project.