Nope, getting
(gedit:5847): Gtk WARNING **: cannot open display:
I did it with the client open, and then closed it and tried it again with the same result.
I've had problems using gedit in sudo mode in the past. Let's try it using vi instead...type exactly as I type:
sudo vi /usr/share/applications/bitcoin-qt.desktop
Type the following (you'll see it at the very bottom of your terminal) and hit Enter
I don't have the file myself, so if it doesn't take you to the line we were looking for last time right away, hit the ''n" key until you're there. Once you're on that line hit:
Insert - End - Enter
Hit Escape
Type the following and hit Enter: