This is not a native Android build, but uses an Ubuntu (or Arch) rootfs in Termux, and exports the GUI with VNC.

Summary:

• Install Termux in Android
• Set up Ubuntu rootfs (or your favorite distro)
• Install a DE like XFCE in it
• Set up VNC
• Install Foliate, and configure it to run without sandbox (which Android does not allow for some reason)

Refer to the comment below for details 👇 👇 👇 👇