VNC via SSH

vncviewer username@server_ip localhost:0

install scim Ubuntu

Select scim from Synaptic ...

#nano /etc/environment

export XMODIFIERS="@im=SCIM"
export GTK_IM_MODULE="scim"
export XIM_PROGRAM="scim -d"
export QT_IM_MODULE="scim"

Lib nessesary when install virtual box

sudo apt-get install linux-headers-`uname -r` build-essential xinetd

Install Ubuntu server 64 bit - VirtualBox

Open Settings of VirtualMachine, choose General/Advance/ , enable PAE/NX

Done!