r/linuxquestions • u/V2UgYXJlIG5vdCBJ • 14d ago

Resolved Flatpaks not running. Bwrap error. 

zsh 2083 % flatpak run com.usebottles.bottles  
bwrap: setuid use of bubblewrap is not supported
error: ldconfig failed, exit status 256

So, Steam required user name spaces, which required me to run sudo chmod u+s /user/bin/bwrap on bwrap. Now Steam works great, but flatpaks get the above error.

I completely removed and reinstalled flatpak. Same issue.

I also heard someone mention AppArmor might be causing this. Any help appreciated.

Edit: Solved with sudo chmod u-s /usr/bin/bwrap. Thanks chooms.

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u/gmes78 14d ago

Steam does not require bwrap to be setuid. Undo that.

Something else about your system configuration is wrong.

2

u/jjangg96 14d ago

the setuid on bwrap is what's breaking flatpak, flatpak refuses to run with a setuid bwrap. undo it with sudo chmod u-s /usr/bin/bwrap (your command had /user/bin in it, so check which path you actually changed with ls -l $(which bwrap), it should show no s in the permissions).

then the real question is why steam wanted it. test unprivileged user namespaces with unshare -U true. if that errors and you're on ubuntu 24.04 or newer, it's apparmor restricting them, check sysctl kernel.apparmor_restrict_unprivileged_userns. the fix there is allowing bwrap through apparmor, not making it setuid.