This might be of interest to those who want to bring their preferred desktop (in this case MATE) along on a phone.
The approach can surely be replicated using an Ubuntu base.
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Interesting, but I would add one practical caveat: on phones the desktop environment is usually the easy part, the awkward bits are input scaling, file access, and whether the container/proot setup gets any useful graphics acceleration. MATE is a sensible choice because it is light and not too tied to a modern GPU stack. For anything beyond tinkering I would also document exactly which Android device/kernel and display server path is being used, otherwise the same steps can behave very differently on another phone.