This did the trick for me (and I also followed the steps to fix that port 53 issue). Now Pi-Hole is running, but I don’t have that generated password. sudo scripts/app install pi-hole doesn’t give me anything. On the pi-hole page it suggests to run sudo pihole -a -p to allow empty password. So how do I get a password and how do you allow an empty password (not sure if I want this, but I’m interested anyway)?
I had the same issue with Pi-hole and other apps. The problem was not enough memory.