Running the command 'sudo dolphin' in Konsole will print out the following: [buck@archie ~]$ sudo dolphin [sudo] password for buck: QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root' "Session bus not found\nTo circumvent this problem try the following command (with Linux and bash)\nexport $(dbus-launch)" This is 100% reproducible. Running printed command (export $(dbus-launch)) does nothing. Opening with KDE su results in the same problem.
Have you tried with 'kdesu dbus-launch dolphin'?
(In reply to Elvis Angelaccio from comment #1) > Have you tried with 'kdesu dbus-launch dolphin'? Yes, that command works.