[Merge] ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/lp-2061121-snap-preseed-latest into livecd-rootfs:ubuntu/mantic

[John Chittum]

Review: Needs Information

Hm, wait, we encode this in the server seeds

https://ubuntu-archive-team.ubuntu.com/seeds/ubuntu.jammy/server

as  

* snap:lxd=5.0/stable/ubuntu-22.04 # Every Ubuntu server can host 100x containers

if i'm reading the code correctly, this _shouldn't_ be solving the issue for snaps in the seeds:

    # Seed from the specified channel (e.g. core18 latest/stable)
    # Or Channel endcoded in the snap name (e.g. lxd=4.0/stable/ubuntu-20.04)
    # Or Ubuntu policy default channel latest/stable/ubuntu-$(release_ver)
    local CHANNEL=${3:-}
    if [ -z "$CHANNEL" ]; then
        case $2 in
            *=*)
                CHANNEL=${2#*=}
                ;;
            *)
                CHANNEL="stable/ubuntu-$(release_ver)"
                ;;
        esac
    fi

also, wouldn't this end up affecting every other snap that doesn't have it encoded or a specific version passed in? so if you just request a pre_seed of $my_snap it'll go to `latest/stable/ubuntu-$(release_version)` which doesn't match the policy...

https://wiki.ubuntu.com/UbuntuSeededSnaps#Channel_availability

So it's special casing around lxd, which may break other things?
-- 
https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/464199
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