I have encountered the same error when trying to run Ubiquity in Kubuntu Vivid. The workaround I found is to type /two times/:
$ sudo umount /run/udisks2/inhibit-polkit
Don't ask me why, but it solved the problem.
I have encountered the same error when trying to run Ubiquity in Kubuntu Vivid.
The workaround I found is to type /two times/:
$ sudo umount /run/udisks2/ inhibit- polkit
Don't ask me why, but it solved the problem.