In Ubuntu20.04 Designer Launcher Login window is broken

I installed Ignition 8.1.25 in Ubuntu20.04.
When I excute Designer Launcher, Login page is broken as attatched Image.

-. Information on how to do this in a Windows environment was found here:
(https://forum.inductiveautomation.com/t/ingnition-designer-launcher-blank-window/38606)
I want to know what to do in an Ubuntu environment.
-. I tried insert -Dprism.order=sw in designerlauncher.desktop file's Exec line
Exec=bash -c 'cd "launcherDirectorypath " && ./designerlauncher.sh -Dprism.order=sw -&' . %k
But it doesn't resolve my issue.

If you have any advise, I would appreciate. Thank you.