Dear Maintainer,

   * What led up to the situation?

On riscv64, trying to install unoconv results in a failure because this architecture does not have libreoffice package:

root@ubuntu:~# apt install unoconv
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 unoconv : Depends: python3-uno (>= 4.0) but it is not installable
           Recommends: libreoffice-writer but it is not installable
           Recommends: libreoffice-draw but it is not installable
           Recommends: libreoffice-calc but it is not installable
           Recommends: libreoffice-impress but it is not installable
E: Unable to correct problems, you have held broken packages.
root@ubuntu:~# apt install python3-uno
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python3-uno is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python3-uno' has no installation candidate

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

Given the strong dependency of unoconv with python3-uno (which is part of libreoffice package), adding a build dependency would fix that problem by not building unoconv for riscv64.

Dear submitter,

as the package unoconv has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1139690

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)