A question regarding this script I wrote not working

cross-posted from: https://gregtech.eu/post/1188873

I made grebuntu to merge all of the separate scripts into one script for all distros, but it doesn't work. The individual scripts do, I tested in VMs. What could have caused the issue? the script in question is tsubuntu.sh btw, can be found in the repo The original scripts are available at https://github.com/Tsu-gu/tsubuntu