Comment # 1 on bug 1137024 from Steffen Winterfeldt

$DISPLAY environment variable unset?

If you're sure it *is* set correctly, reopen this bug and attach yast logs.

To collect log files run 'save_y2logs' and attach the log file archive this
command creates.

If you're unsure what to do, please have a look at

https://en.opensuse.org/openSUSE:Report_a_YaST_bug#logfiles