Команды в терминале eos-dev-*

Что произойдёт если в терминале я напишу eos-dev-unlock и eos-dev-fix?

Both are intended for internal usage at Endless.

eos-dev-unlock will make /usr writeable, but nonetheless you won’t be able to install applications using the apt command, as the only configured apt source is not available to the outside world. Sure you probably can add some source manually, but it will probably break your system in some unpredictable ways.

eos-dev-fix is used to stop the autoupdater and update the system package cache after eos-dev-unlock has been run.

Don’t run any of these commands

If you really need the ability to install software using apt, consider running a Ubuntu instance with Podman and installing everything you need there.