LibreOffice is not available on riscv64.
Don't require it for installation of package gnome on riscv64.
$ sudo apt-get install gnome
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:
gnome : Depends: libreoffice-gnome but it is not installable
Depends: libreoffice-writer but it is not installable
Depends: libreoffice-calc but it is not installable
Depends: libreoffice-impress but it is not installable
Recommends: nautilus-extension-brasero but it is not going to be installed
Recommends: gnome-remote-desktop but it is not going to be installed
Recommends: gnome-games but it is not going to be installed
Recommends: transmission-gtk but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
I don't believe this needs a Feature Freeze Exception. It looks like a bugfix to me.
Do you have time to submit this directly to Debian instead?
https:/