I've found the reason for this behavior. Here is a patch which correct it.
Patch is most probably incomplete. I have no idea what is blkid or libvolume_id 
but it works.

** Attachment added: "fix for umount'ing volumes mount by user and UUID"
   http://librarian.launchpad.net/5596114/util-linux_mount.patch

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Can't unmount UUID= volume as a user
https://launchpad.net/bugs/71609

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