This is a bug that has existed for a while now.
When being used on Linux, the mouse appears very "blocky", and not properly responding if moved slowly. There have been a number of people who have reported this.
To reproduce:
Use a Linux computer in any game, and try to pan the map with the mouse slowly. Notice how the movement is very jagged.
This bug has been continuing on for a while, and I would really appreciate it if it could be addressed, as it makes the game very hard and unfun to play.
I have both DLCs and have all of my mods disabled.