Comment 7 for bug 957641

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Sebastien Bacher (seb128) wrote : Re: unity does not display authentication window for pkexec

the fact that dialog was not displayed has nothing to do with unity, it's pkexec which requires a config file allowing to keep the display for the command being run, the bug was in gnome-system-log

the fact that unity doesn't display command line errors in a graphical way when an application fails to start is another issue which got reported and is already being tracked in another ticket