[vgel]

I run PopOS (System 76's Ubuntu derivative) on my T490, and it works flawlessly with all the upgrades (aftermarket SSD and RAM). I think the only major system-level config I've done is install TLP for better power management.

I would recommend PopOS over plain Ubuntu because they have some nice utilities for managing things like hidpi, and in my experience hardware "just works" more often, e.g. wifi.

Caveat, I didn't get the discrete GPU, those can be hell, and I made sure to get an Intel wifi chipset (same price) since it has the best Linux support.