Re 1: You can compile and install software in parallel using alternative location (not possible if you install from binary packages). Standard would be /usr/local/ instead of /usr/ - this will keep separate version of software for you with executable file located in /usr/local/bin/
Re 2: Astroberry provides stable versions only. Firecapture 2.7 will be available when release reaches stable status (not beta). However you can uninstall v2.6 and install 2.7beta manually
Re 3: Siril is not included in Astroberry image How did you get it?
Re 4: I was not aware of PlanerarySystemStacker. Looks nice indeed. I was trying to install it on my ubuntu desktop and... ended up with similar errors. I would suggest to report this as a bug on PSS github.

Last but not least, welcome to open source astronomy! Share your experience with other users and enjoy!

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