Created attachment 104523 [details] backtrace 3.0.1-0neon+16.04+build3 amd64 KDE neon LTS User Edition 5.8 To reproduce: Launch partitionmanager from Application Launcher or Terminal in an unprivileged user session. Click "Ignore" or "Cancel" on KDE su window. Click "Run without administrative privileges". Expected: Partition manager still opens in limited mode without ability to apply operations. Actual: KDE Partition Manager Closed Unexpectedly (see backtrace) The following output if running from terminal: org.kde.kdesu: Daemon not safe (not sgid), not using it. Loaded backend plugin: "pmlibpartedbackendplugin" "Using backend plugin: pmlibpartedbackendplugin (1)" "Scanning devices..." QSocketNotifier: Invalid socket 6 and type 'Read', disabling... The X11 connection broke (error 1). Did the X11 server die? KCrash: crashing... crashRecursionCounter = 2 KCrash: Application Name = partitionmanager path = /usr/bin pid = 4798 KCrash: Arguments: /usr/bin/partitionmanager --dontsu KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi from kdeinit sock_file=/run/user/1001/kdeinit5__0
*** This bug has been marked as a duplicate of bug 375394 ***