Sysbox 0.7.0 not working on ubuntu 26.04

[GuillaumeSavin]

Since upgrade from ubuntu 24.04 to ubuntu 26.04 sysbox cease to work, i got this message when trying to launch my stack with docker compose

Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: failed to pre-register with sysbox-fs: failed to pre-register container with sysbox-fs: rpc error: code = Internal desc = Initialization error for container-id

And when I verify the log of sysbox-fs with journactl -u sysbox-fs I found:

sysbox-fs[20604]: 2026/04/27 23:43:05 mount helper error: fusermount3: mount failed: Permission denied
sysbox-fs[20604]: time="2026-04-27 23:43:05" level=error msg="fusermount: exit status 1"

I try several thing like reinstall sysbox even full uninstall and then reinstall, restart sysbox sysbox -fs and sysbox-mgr, reloading fuse but nothing seems to work

[GuillaumeSavin]

I found a workaround, first I needed to install apparmor-utils (apt install apparmor-utils) to put fuseusermmount3 in complain mode with aa-complain /etc/apparmor.d/fusermount3 then restart docker and sybox with systemctl restart docker and systemctl restart sysbox you should now be able to start your container with sysbox-runc (maybe you will need to recreate them)

[GuillaumeSavin]

maybe a good way to keep apparmor security at much as possible would be to add a sort of profile/exception for just sysbox so we don't need to put fuseusermount3 in complain mode

[w7team]

I see this fork is still being actively maintained; you can submit it to him at https://github.com/thieso2/sysbox

[w7team]

cc @thieso2