It can be related to this bug #107963 I forgot before to say sometimes I get the same message as the bug above.
-- Cannot unmount volume: not very helpful error message https://bugs.launchpad.net/bugs/81239 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
