I am running 20.04 with latest patches and I wanted to do some tests so I installed the package docker.io. Now that my tests are over I wish to purge this package but it doesn't seem to wish to cooperate spitting out a ERROR: Not a Btrfs filesystem: Invalid argument when using either apt or dpkg:
$ sudo apt purge docker.io -y
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following packages will be REMOVED:
docker.io*
0 upgraded, 0 newly installed, 1 to remove and 10 not upgraded.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 456609 files and directories currently installed.)
Purging configuration files for docker.io (20.10.12-0ubuntu4) ...
Nuking /var/lib/docker ...
(if this is wrong, press Ctrl+C NOW!)
+ sleep 10
+ btrfs subvolume delete /var/lib/docker/plugins/storage
ERROR: Not a Btrfs filesystem: Invalid argument
dpkg: error processing package docker.io (--purge):
installed docker.io package post-removal script subprocess returned error exit status 1
Errors were encountered while processing:
docker.io
E: Sub-process /usr/bin/dpkg returned an error code (1)
$ sudo dpkg --purge docker.io
(Reading database ... 456609 files and directories currently installed.)
Purging configuration files for docker.io (20.10.12-0ubuntu4) ...
Nuking /var/lib/docker ...
(if this is wrong, press Ctrl+C NOW!)
+ sleep 10
+ btrfs subvolume delete /var/lib/docker/plugins/storage
ERROR: Not a Btrfs filesystem: Invalid argument
dpkg: error processing package docker.io (--purge):
installed docker.io package post-removal script subprocess returned error exit status 1
Errors were encountered while processing:
docker.io
$
Any ideas why and how I can fix this?