Base on tutorial from http://www.mrbass.org/linux/ubuntu/scim/

1. Add universe repository to your source list (/etc/apt/sources.list)
2. Do apt-get update
3. Install package for scim
 sudo apt-get install uim anthy scim-gtk2-immodule scim-uim scim-chinese scim-hangul scim-tables-zh scim-tables-ja scim-tables-ko
4. Add SCIM to startup for X11
 sudo touch /etc/X11/Xsession.d/74custom-scim_startup
 sudo chmod 646 /etc/X11/Xsession.d/74custom-scim_startup
 echo ‘export XMODIFIERS=”@im=SCIM”‘ >> /etc/X11/Xsession.d/74custom-scim_startup
 echo ‘export GTK_IM_MODULE=”scim”‘ >> /etc/X11/Xsession.d/74custom-scim_startup
 echo ‘export XIM_PROGRAM=”scim -d”‘ >> /etc/X11/Xsession.d/74custom-scim_startup
 echo ‘export QT_IM_MODULE=”scim”‘ >> /etc/X11/Xsession.d/74custom-scim_startup
 sudo chmod 644 /etc/X11/Xsession.d/74custom-scim_startup
5. Restart your desktop
6. To start using scim, press ctrl (control) + space on your keyboard.