Update, hope i remember everything.. i ended up following the instructions @
https://github.com/hkroeger/insightcae-documentation/commit/89a21df4c5659a8c266d9a1fb9bb131dd54bb055Eventually i got stuck at line 188 since workbench would not run, i checked the shortcut and run "bash -lc workbench" directly in the console and it worked.. a GUI opened. I closed it and restarted my PC as instructed on line 195.
Run the Start Menu "workbench" shortcut but had the same issue, a console opened and closed immediately as before.
i opened the linux console again, and the following events are evident on the console screenshot

As a result, the case builder showed up
If i open a console in the main InsightCAE directory and run "source /opt/insightcae/bin/insight_setenv.sh", i can then run either "workbench" or "isofCaseBuilder" or "iscad"