

Latest release seems to have been in March 2025. The version you get would depend on how you installed it. For Ubuntu/Kubuntu it looks like maybe they point to the Snap store? I have no idea how well that works and personally would avoid it.
Did you do that, or, download a deb or install “printer-driver-gutenprint” via apt?
In another comment you said you have the Canon proprietary driver. I think you would need the CUPS driver for this to work.
I didn’t do this recently enough to remember what the process looked like. But in your situation I would probably try to uninstall everything print related, reboot, and then start with sudo apt update -y && sudo apt install printer-driver-gutenprint
and see where that gets me.
For DIY consider a setup that supports ECC RAM to help prevent corruption. Any good server motherboard should do.
Unraid is pretty easy to get going on. That’s probably the direction I would take in your situation.
Also, if you’re not doing 3-2-1 backup now might be a good time to consider an off-site backup plan. That 4-bay Synology at a friend’s house with a VPN path would be an option for critical data. You could give them some partitioned space on there and on your new NAS to compensate for the power usage. Setup Borg or Restic and it’ll be encrypted on the remote NAS, and benefit from incremental and dedupe to minimize bandwidth usage.