CephFS mount args break LXD 6 on jammy

[roosterfish]

Distribution

Ubuntu

Distribution version

22.04

Expected behavior

Mounting a CephFS pool should succeed.

Actual behavior

When using latest LXD 6 on jammy, the following error can be observed in the LXD logs:

2026-04-20T10:33:40Z lxd.daemon[15710]: time="2026-04-20T10:33:40Z" level=error msg="Failed mounting storage pool" err="Failed mounting \"admin@94454ecb-7b89-444c-85ca-d0172ece0e8f.lxd_cephfs=/\" on \"/var/snap/lxd/common/lxd/storage-pools/remote-fs\" using \"ceph\": invalid argument" pool=remote-fs

Equally in dmesg you can see ceph: No path or : separator in source.

Steps to reproduce

1. Deploy a jammy system
2. Install LXD snap install lxd --channel latest/edge
3. Create a CephFS pool (LXD will try to mount it) -> errors