I actually get an authentication box pop-up when entering that command - I have both gnome and KDE installed - but using KDE - and what looks like it pop's up is the Gnome Authentication box - Attached png -
I actually get an authentication box pop-up when entering that command - I have both gnome and KDE installed - but using KDE - and what looks like it pop's up is the Gnome Authentication box - Attached png -