Comment 16 for bug 1816226

> I did
>
> apt purge libsane-hpaio libhpmud0 hplip-data hplip printer-driver-postscript-hp

*Everything* associated with HPLIP has to go. That particularly includes /usr/share/hplip/ and /var/lib/hp. Leaving anything on the system gives it a chance to complain. I think there may even be files in /etc/hplip and $HOME/.hplip. 'apt purge hplip' is a good starting point.

This should also get rid of anything the installer for hplip-3.19.1 put there but, because I am not familiar with the .run file, I am a little unsure about all the files it installs. I believe it has an uninstall script.

I am expecting that

  scanimage -d hpaio:/net/colorlaserjet_mfp_m278-m281?ip=192.168.0.88

or

  xsane -d hpaio:/net/colorlaserjet_mfp_m278-m281?ip=192.168.0.88

should work after doing this.

(I do not think &queue=false is important).

I am still puzzled by any need for a plugin. But it can be tried. If it comes to it, installing it won't do any harm.