Have you tried waiting the recommended few minutes?
https://bugs.launchpad.net/ubuntu/+source/devmapper/+bug/105623 is a known bug, and is mentioned in the release notes.
Have you tried waiting the recommended few minutes?
https:/ /bugs.launchpad .net/ubuntu/ +source/ devmapper/ +bug/105623
is a known bug, and is mentioned in the release notes.