Container startup cannot create cgroup

[tomp (Thomas Parrott)]

Seems like an issue with the host’s cgroup setup, the error “Failed to create cgroup at_mnt” was mentioned in here too:

https://github.com/lxc/lxd/issues/10650#issuecomment-1180435976

You could also try this:

Error: The image used by this instance requires a CGroupV1 host system when using clustering

This isn’t specific a standalone or clustered LXD setups, it is to do with the cgroup setup of the LXD host compared to what the image you’re trying to use requires. Running older container OSes on more modern host systems that use CGroupV2 can produce this conflict. To resolve it you need to boot your host system into CGroupV1 mode by modifying your kernel’s boot arguments to include: systemd.unified_cgroup_hierarchy=false Then: sudo update-grub