The free Update 1.5 and the (paid) DLC Taste of Adventure to the game Parkitect are now availabe for Linux on Steam.

The big free update to Version 1.5 and the paid Taste of Adventure expansion are available now.
Here's a summary of all the changes:

Taste of Adventure expansion (paid):

The (paid) DLC "Utah" for the American Truck Simulator is now available for Linux on Steam!

Features

Also itch.io has a Halloween Sale 2019!

It seems to last until 03.11.2019.

GOG also has a Halloween Sale 2019.

It will last until 04.11.2019.

The Steam Halloween Sale 2019 has begun!

It will last until 01.11.2019.

In the night to Sunday the Debian-Team has released the new stable version 10 (Codename "Buster") of Debian Linux!

Before an upgrade from Debian 9 ("Stretch") you should read this and this document.

Valve has released the Version 4.2.8 of Proton in the Steam Client for Linux:

4.2-8: