I like boot my computer to multi-user.target ( it is command line ) and I like Cinnamon desktop environment. But I can NOT to start Cinnamon desktop environment from command line : root@ferrum:~# cinnamon-session **(cinnamon-session:51470):WARNING**:Cannot open display: This notification is the single result of command cinnavon-session, Cinnamon X session does NOT start ! . . . This does NOT depend from existence or value of the DISPLAY environment variable.