官方提供的安装是这样的：
$sudo apt-get install scim scim-modules-socket scim-modules-table scim-pinyin scim-tables-zh scim-input-pad
$sudo sh -c " echo 'export XMODIFIERS=@im=SCIM ; export GTK_IM_MODULE="scim" ; export QT_IM_MODULE="scim" ; scim -d ' > /etc/X11/Xsession.d/95xinput "
$sudo chmod 755 /etc/X11/Xsession.d/95xinput
# 注：在Dapper下省略后两步
#注：在Dapper里也可以直接选择系统－>系统管理—>语言支持（language support）勾选Chinese 就会自动安装和配置scim