I believe it is not possible to install Ubuntu packages on Astroberry as they are based on different OS.
I prefer running Kstars on Ubuntu as it receives frequent updates from Ubuntu PPA repositories and you can switch between stable and nightly releases.
Here is a script which builds a fully functional system based on Ubuntu automatically:
github.com/avarakin/AstroPiMaker4
You can run the whole script or only install individual components, e.g.
make vnc
to install vnc only.

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