I downloaded Manager on my test machine (Lubuntu 20.04 Pentium Core Quad CPU 8GB Ram 500GB SSD), copied it to my Desktop, chmod u+x, made sure the permissions were OK and trusted, and it works great.
I copied it to the production machine with same specs except Celeron J series cpu, did all the same changes and checks, and I get command not found when trying to start from Terminal or just nothing if I try and start from the icon.
What have I missed ??