Make sure you have microsoft fonts installed first of all.
sudo apt install ttf-mscorefonts-installer
> Run sudo su to gain root privileges.
> Run echo “DefaultLimitNOFILE=1048576” >> /etc/systemd/system.conf
> Run echo “DefaultLimitNOFILE=1048576” >> /etc/systemd/user.conf
> Run systemctl daemon-reexec.
These are said to be are necessary for GTA V to run...
Is this new though? Apart from the fonts install before GTAV worked pretty much out of the box before. So it is probably not Proton related.
Generalistic and moderated instance.