Comment # 1 on bug 1190837 from Jonathan Kang

(In reply to Roi C. from comment #0)
> I'm getting "Unable to read system logs" message from gnome logs. 
> Journalctl works flawlessly and I can read the logs from yast without any
> problems.

This is working as intended. When you see "Unable to read system logs", click
the "help" button next to it to see why that's happening.

Normal users can only view journal from the current user. To view system
journal, you'll need administrator permission or be in the "systemd-journal"
user group. You can view those logs from yast because you have input your root
password when opening yast. By default, "journalctl" works and only shows logs
from the current user. You can try "journalctl -k" and see what this command
shows you.