First, I did try to search the forums but did not have any success. I found the search not to be super effective but it could be the user. I’ve been a SUSE user for almost a decade and I’m currently having a brain fart and can’t seem to fix a simple issue. I’m trying to run a sudo’d app “ie: sudo dolphin” in a terminal and I keep getting “cannot open display”.
A normal fix would have been to set the display and export it using " DISPLAY=:0.0; export DISPLAY" but that doesn’t seem to work.
Help?!
Running KDE on OpenSUSE Factory (currently updated as of today)
You can open dolphin as super user under menu/system/filesystem superuser.
Right.
And for other applications, use kdesu instead of sudo to run them as root.
Background: Applications run as a different user are not allowed to open windows in the user’s X session by default. And they might need more in the environment than just $DISPLAY, e.g. the address of the current D-BUS session.
That’s nothing new, btw. 
D’oh! Didn’t know that. thanks!
I have never found a search function in a forum that seems of any real value.
Instead, I go here:
and enter a search such as
opensuse sudo "cannot open display"
