[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:canary-dedup-snaps into livecd-rootfs:ubuntu/master

[Steve Langasek]

Review: Approve

5.7G    daily-canary/20230823.2/mantic-desktop-canary-amd64.iso
4.0G    daily-canary/20230823.3/mantic-desktop-canary-amd64.iso

Success!
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/449698
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