The post rm script calls `nuke-graph-directory.sh` which relies on these
predicates to identify btrfs subvolumes:
if command -v btrfs > /dev/null 2>&1; then
# Find btrfs subvolumes under $dir checking for inode 256
# Source: http://stackoverflow.com/a/32865333
for subvol in $(find "$dir" -type d -inum 256 | sort -r)
Which on my system (not using btrfs) returns many directories.
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https://bugs.launchpad.net/bugs/1814149
Title:
docker.io post-removal script fails to delete btrfs subvolume, when
/var/lib/docker is on an ext4 filesystem
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