Terminal doesn't allow me to run the next command :(
 

OK. I started ubuntu in Consule mode, then i did "xinit" to start X Window System, then i did "metacity" to start window manager and then it looks like this..

And that's it.. queenz@queenz-ubuntu:~$ line doesn't appear anymore.. :( Maybe there are some tricks that i can do to be able to run the next command?

Did you try typing "ctl-z"? Your metacity program is running in the foreground of the terminal and won't return to the terminal prompt until it finishes or is terminated by you. If you type ctl-z it should move to the background then you'll get your terminal prompt back.
cheers,
jdk

You can place a '&' at the end of the metacity line, or type "[CTRL]-z" and then "bg" to pause the last command and then put it in the background.

Of course metacity doesn't do much by itself, you might just want to create a script to start xterm or something, then metacity - edit .xinitrc, for instance and then just use startx.

thanks, i didn't know that :)

If you press ctrl+Z, metacity will be backgrounded but also suspended. You must then type "bg" to allow it to resume in the background.

Or, type "metacity &" in the first place.