Mouse can't work on Ubuntu Server (minmal virtual machine mode) in VBox VM. I ran:

sudo aptitude install --without-recommends xserver-xorg-core
sudo aptitude install jwm
startx

output:

-bash: startx: command not found.

Update: OK, xinit was missing.

Update 2: So I ran:

sudo aptitude --without-recommends install xinit  

installation ok, then:

startx

output:

/etc/X11/xinit/xserverrc: 3: exec: /usr/bin/X: not found
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error

Update 3: Some package were left out! So I purged all before mentioned and reinstalled all three except no --without-recommends flag this time.
Apparently I can access the simple graphical desktop but with problems. Mouse won't move. Output from tty; can't roll up, it has cancel at this point (or has it ended outputing?)

loading extension GLX
The XKEYBOARD keymap compiler (xkbcomp) reports:
Warning: Type "ONE_LEVEL" has 1 levels, but has 2 symbols
Ignoring extra symbols
Erros from xkbcomp are not fatal to the X server

What is wrong this time ?

Thanks for your time.