JQ error with Bullseye

[Bucking_Horn]

@deHakkelaar

EDIT: I moved below edit up here because its the most likely candidate for your issue if it shows pinning of the jq package

My below comment was now still lingering in the original topic:

@RSickenberg

  Candidate: (none)
  Version table:
     1.6-2.1 -1
         -1 http://raspbian.raspberrypi.org/raspbian bullseye/main armhf Packages

That is some strange output: It's reporting no installation candidate, but the referenced repository is correctly listed in your sources.list:

@RSickenberg

~ » cat /etc/apt/sources.list                                                                                                                                                          
deb http://raspbian.raspberrypi.org/raspbian/ bullseye main contrib non-free

Please share the outpout of:

ls -lah /var/lib/apt/lists