Can't migrate VMs after update to 25.04

[Stux]

@Foxtrot314

The root disk must always exist and is the only one that gets snapshotted, backed up and moved around as part of the instance.

The root disk must always exist… but you can replace it…

HOWTO: Replace an Incus VM root device with an external zvol

In Fangtooth 24.04RC-1 you can create Incus VM Instances with an external zvol attached. This is a good way to migrate an existing VM into the Incus system, but you will be left with a dangling “root” 10GiB volume attached to your VM. There is no harm in this, and it uses a trivial amount of space, but perhaps it annoys you and your would prefer to replace the root disk with the external zvol, and fully migrate your VM into the Incus ecosystem. WARNING: Incus 6.0.3 LTS is prone to erasing exi…