Posting this solution here just in case this happens to anyone else. The client had requested using a small instance and the new guy didn't check it against memory requirements of cyberpanel (512 vs 1028...) so can't use CP on the smallest Lightsail Instance...
This what we see on screen (just for people seaching for a solution)
Cloning into 'cyberpanel'...
remote: Enumerating objects: 35220, done.
remote: Counting objects: 100% (617/617), done.
remote: Compressing objects: 100% (250/250), done.
remote: Total 35220 (delta 386), reused 550 (delta 348), pack-reused 34603 (from 1)
Receiving objects: 100% (35220/35220), 449.10 MiB | 35.11 MiB/s, done.
fatal: fetch-pack: invalid index-pack output
git clone
https://github.com/usmannasir/cyberpanel.git has failed for 7 times
Wait for 3 seconds and try again...