I was never able to get my HP printer to work in Debian Minimal, despite installing all the necessary packages. My printer works fine in Debian. There must be a missing package for printers to work in minimal.
The only things I install are hplip, hplip-gui, and system-config-printer. Once this is done, however, you need to run system-config-printer on the template to set up the printer (or forever be doing it in your appvm/disposable). [yes, running even that setup on a template is suboptimal! I’m working on shifting the printer to a dedicated template so at least only that one template is contaminated.]
To use the scanner (if you have a combined scanner/printer) one must install some sort of scanner software (e.g., simple-scan) on the qube that’s going to do the scanning, otherwise, your printer/scanner will simply think it’s not hooked up to anything.
@Sven apologizes to point you directly to this issue but I remember you as a Debian minimal expert. Hopefully, you can support us on this printer issue on (deb-11-minimal) or at least provide us some hints to further dig into this issue (currently we have no approach to debug since everything looks ok; but the printer process is simple not executed).