Debian Upgrader Script (buster, bookworm, bullseye) with basic menu

It's a basic bash script that helps you with the upgrade process.

What it does:

• Sets up the repositories
• Checks for some errors in certain config files
• Starts the upgrade
• Checks for current OS version
• Cheks for pending restart after upgrade

It's good for Debian 10 -> 11 and for Debian 11 -> 12

This is how it looks like:

It's important to run this script with elevated rights, preferably as root.