The very huge Updates 1.40 for Euro Truck Simulator 2 and American Truck Simulator are now available for Linux on Steam. The complete list of all changes (for ATS/for ETS2) is large, and include a completly new lighting system for the underlying engine and also revamped trucks and cities. Short Changelog ATS:

Changelog: Visual: New visual lighting system Map: New viewpoints in New Mexico & Oregon DLC’s An overall update to road signage New service signs added to CO, ID, UT, and WA New fast food brands introduced to several other locations outside of CO Vehicles: New 4x2, 8x4, and 8x6 chassis Western Star 49X update including sleeper variants, set-back configurations, and new customizations UI Full-text city/company search in the job selection screen Improved vehicle adjustment menu (F4)

Short Changelog ETS2:

Changelog Visual New Visual Lighting System Map Germany Reskin New French Cities (Vive La France ! DLC) Vehicle Two new paint jobs (from the Super Stripes Paint Jobs Pack) for owned trailers UI Full-text city/company search in the job selection screen Improved vehicle adjustment menu (F4)