For both Trucking-Simulations Euro Truck Simulator 2 and American Truck Simulator the Update 1.34 has been released for Linux on Steam.

The Changelog to Euro Truck Simulator 2 :

Changelog

MAN TGX Euro 6
Timezone areas fixed - Kaliningrad area, RU (Beyond the Baltic Sea map expansion required)
Many little map fixes and world polish added

The Changelog to American Truck Simulator:

Changelog

Buyable Log trailer
Tonopah city refreshed
Another segment of OR-140 (Oregon map expansion required)
Timezone areas fixed - Malheur county, OR (Oregon map expansion required)
Numerous little map fixes and world polish added