Are you unable to launch the vanilla version of the game too?

Are you unable to launch the vanilla version of the game too?

I can't launch it in vanilla either from the launcher. What does work is installing steam in distrobox, opening it, and then using r2modman. This makes sense because distrobox steam isn't sandboxed.

I have the same issue. Oddly enough, I was able to launch unmodded before I had to reinstall r2modman to solve a different issue. Now I can't launch either way. So I'm not entirely sure if it's really a Steam problem?

Edit: This reddit post seems to offer a solution/workaround?

I was able to get it to work with the steam launch command in the "help" section after adding "xdg-config/r2modmanPlus-local" file permission in flatseal for steam. Listing this somewhere could be helpful.

I have the same problem playing Lethal Company. I've managed to work around this by having r2modman manage and download mods and I put the necessary files manually.

Do you think a "permanently install mods" is a good feature idea? Wanted to open a feature request but then noticed this issue.

I was able to get it to work with the steam launch command in the "help" section after adding "xdg-config/r2modmanPlus-local" file permission in flatseal for steam. Listing this somewhere could be helpful.

I've tried this as well however does not work on my end. I'm running Kubuntu 24.04 with Steam via Flatpak and r2modman via .deb install (appimage gave error). I've ensured BepInEx bash scripts are executable and added various r2modman directories to Flatseal including the one quoted above. I've also updated Valheim properties to launch using the launch command on r2modman help tab and restarted Steam to ensure all settings should be in place. I can launch the game via Steam however it launches without mods.

I've also asked for help on the Valheim and Thunderstore Discord servers though so far no other ideas.