I ran into this too. I think this is because there is no longer a
/sbin/btrfs. In /usr/lib/python3/dist-packages/apt_btrfs_snapshot.py :
if not os.path.exists("/sbin/btrfs"):
return False
Ubuntu 16.04 apparently places btrfs in /bin.
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https://bugs.launchpad.net/bugs/1634871
Title:
apt-btrfs-snapshot reports "Sorry, your system lacks support for the
snapshot feature" on btrfs with existing @apt-snapshot-release-upgrade
snapshots
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