I know there isisnt a Linux version and yes i am running it under proton with protontricks but maby some1 had this problem before and has a solution or advice (i rly despise m$ os with a passion just wanted to share)
but as to save games you acctualy helped me - some times simplest solutions are illusive
for any1 intersted save games under windows are obviously Documents/underrail
BUT
under Manjaro /home/Your User Name/.local/share/Steam/steamapps/compatdata/250520/pfx/dosdevices/c:/users/steamuser/My Documents/My Games/Underrail/
and as it turns out 3 of 5 save (not including quick saves and autosaves) are corrupted
but tnx for the advice