Phosh runs on the development images by default. If you want to hack on it, you
need to build it from source, obtained from the Phosh repository. You will
also need to install the Phoc compositor.
Building and Running Phosh
To build and run Phosh, follow the instructions in the README file from the
repository. If you want to run it from the source tree you can omit the
ninja -C _build install step.