Before I start asking my question, I would like you to know that I am aware of the Different linux distros sharing the same /home folder? question already asked on this website. It did not quite answer my question though, and as it's too broad I don't think it ever will. Is it possible to share the user directory between Ubuntu and Arch, and how to make that work? I'm talking about what's known as ~. I already have Ubuntu installed, but I am really annoyed by outdated packages. I would like to run them next to each other so when I need to use new software I can use ArchLinux. I could just switch completely to ArchLinux, but I don't want to take any risks. (Maybe I'll hate it) Just as a sidenote, my /home is on a different partition, but my users' directories also encrypted. 
Share Home Directory between Arch and Ubuntu
ubuntu;arch linux;dual boot