> The following packages have unmet dependencies:
> openboard : Depends: libfdk-aac1 (>= 0.1.6) but it is not installable
> E: Unable to correct problems, you have held broken packages.
Clear. You also need the non-free repository of Debian activated in your sources.list because the library
libfdk-aac1 is there.
Indeed, adding non-free fixed the problem.
However I hope that you are considering this a workaround, not a solution, because the installation script (`fuss-client`) should do this automatically, if needed.
# apt policy libfdk-aac1
libfdk-aac1:
Installato: 0.1.6-1
Candidato: 0.1.6-1
Tabella versione:
*** 0.1.6-1 500
500 http://deb.debian.org/debian buster/non-free amd64 Packages
100 /var/lib/dpkg/status