GUI Desktop environment

First of all, you have to understand that sarchile (or Arch Linux) is not installed on your system, whenever you start sarchile means you use Android system (Termux providing terminal interface for interaction with) to work inside Arch Linux environment.

Thus, you cannot expect to install a set of Desktop environment or Window Manager and have them beam on your Android screen.

This is why we suggest you to read Better understanding as we take WSL on Windows a good example for sarchile.

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Further instruction is being written...