[Bug 45704] Prompts for root password to change priority.

[Nat Tuck]

Public bug reported:

Ran gnome-system-monitor and selected the Edit -> Change Priority item
after selecting a process. When I changed the priority to -4 and pressed
OK, I was prompted for the root password.

Since there is no root password in my default install of Ubuntu, that
clearly wasn't going to work out.

** Affects: gnome-system-monitor (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

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Prompts for root password to change priority.
https://launchpad.net/bugs/45704