Byzanthium- why the missing dependencies

Hi all!
New to the forum, but have been using Purism for just over 24 months now.
I made the jump to the latest PureOS and essentially have tried to replace everything I had on PureOS 9.
I find that with the byzanthium repository source, certain packages and dependencies are broken.
I also installed Gnome for a better choice for apps, etc however, the updater doesn’t show in app menus at all…
Can anyone assist with some direction for stable repositories with reference to the above…?

Thanks in advance.

Hello! Can you show what the missing dependencies look like, for example specifically which command(s) you are trying to run and what error messages you get?