Looking at your logs it looks like your Proton installs are outside your home directory but on an external drive /run/media/... if I am not mistaken here?
It's internal(I just mounted it there because I misunderstood some things moving to openSUSE after years of Debian/Mint/other Debian-based distros), but yes it's NTFS, carried on from a dualboot setup years ago. I'll try moving some games and proton to home directory tomorrow, I'll need to make some room first.
I am having a similar issue to this on KDE Neon. Noticed it about 5 days ago. No games can be launched in Steam via proton. (Have not attempted to launch outside of Steam). All the games I have tested (Baldur's Gate 3 and Deep Rock Galactic to give two examples), previously worked perfectly.
Current symptoms:
PROTON_LOG=1 %command% launch option.Attempted fixes, in order:
zenity via apt-get, since it was missing but required. Steam client has scaling issues. Issue persists.System
OS: KDE neon 6.0
GPU: AMD Radeon RX 7800 XT
Kernel: 6.5.0-21-generic (64-bit)
Storage: Steam Installed on the system ext4 drive. Games library on separate ext4 drive mounted under /media/battleship with the following fstab options defaults,noatime,discard 0 1
FWIW, I'm having the same issue with Deep Rock Galactic, but other games seems to work fine.
I forced Deep Rock Galactic to Proton 8 and now it starts. Do you have by any chance the Proton 9 beta installed? That might be the cause.
Replying to https://github.com/ValveSoftware/Proton/issues/7541#issuecomment-1982128478
any update for this? i have the same issue, i remove kde i use gnome with x11 and none games run, i try to make something different with remove ntfs-3g.
Sorry it took so long, a few things happened and got in the way.
I can now confirm that after moving to a non-Windows drive the games just work. I guess I can close now.
Your system information
Steam Client Build Date: Sat, Jan 13 1:52 AM UTC -08:00
Steam Web Build Date: Fri, Jan 12 6:02 PM UTC -08:00
steam-logs.tar.gz
Please describe your issue in as much detail as possible:
When pressing the PLAY button in the library view, the button shows CANCEL for a time(depends on game), then shows STOP for approximately 1,5 seconds, before reverting to PLAY again. No error is displayed at any point.


However, I tried to launch some games outside of the Steam client and they work fine outside of not having any save data(Holocure and Micro Mages shown in attached screenshots).
However, games that are wine-wrapped out of the box(like Earth 2150) don't launch outside of Steam either.
I tried EVERY version of the Proton Runtime with at least Holocure, and several versions with other games.
Steps for reproducing this issue: