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.

The Gutenprint plugin has support for a bunch of Canon printers. I haven’t used it in a while but I remember it supporting borderless prints with CUPS drivers. Maybe not for all printers? Worth a look at least.