[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:no-snaps-ubuntu-cpc-minimized into livecd-rootfs:ubuntu/master

[Balint Reczey]

Instead of adding an lxd-installer package which have not passes NEW review and is fishy for not declaring Conflicts: with lxd but shipping the same commands I recommend simply dropping lxd from the minimal image or shipping in a missing-snap way added in LP: #1821924.
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/364222
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