They recently made a tool that handle the update to a new LTS. I upgraded from mint 20 to 21 and it went very well aside from the the printer stopping. Tried everything and it still doesn’t work. It’s not even a modern DRM galore bullshit printer, It’s an ancient canon lbp6000 laser printer so I honestly don’t know why it stopped.
If anyone got any idea how to fix it, I’d highly appreciate it.