To figure out what accio might mean I tested the "nautilus" command on Ubuntu 16.04.2:
1) in an Xterm in an X session: a "Files" window is opened. But why would one want to do that as clicking on the File Manager in the dock also opens a "Files" window.
2) when logged on on an alternate screen (e.g. via Ctrl+Alt+F2, or Windows+F2 in VirtualBox): Failed to connect to Mir ... Issuing "init 4" (as root) on that alternate screen fails to "go GUI", but "startx" (as root or non-root) does. Alas there is no dock or dash then. But via a rightclick one can open an Xterm and issuing "nautilus" in there open a "Files" window.
For Porteus the equivalents are:
1) type the name of the File Manager -- which depends on the Porteus flavour, e.g. "caja" for Mate.
2) "init 4" and "startx" open a "full" GUI, so no additional commands are necessary.