Since ETS2 and ATS have native support on Linux I wanted to try it.
Installed steam, installed ETS2, started up the game, tried to play the tutorial: no textures!?
After some investigation I found out that the (X)Ubuntu I’m running is missing a package that provides texture compression to Mesa.
It’s called libtxc-dxtn-s2tc, and having installed that it works like a dreams!
You can install it by using your favourite package manager or via terminal:
sudo apt-get install libtxc-dxtn-s2tc
Hope this helps you out as well!