修改ubuntu開機自動開啟或關閉X Window

關閉方法：

編輯/etc/default/grub
修改GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash” 或””
改成GRUB_CMDLINE_LINUX_DEFAULT=”text” 或”quiet splash text”
再執行update-grub


開啟方法：
與上步驟相反的設定
或startx
或sudo service gdm start

referrence
http://askubuntu.com/questions/16371/how-do-i-disable-x-at-boot-time-so-that-the-system-boots-in-text-mode

http://askubuntu.com/questions/276937/how-to-efficiently-enable-disable-gui-in-ubuntu-server-12-04

http://askubuntu.com/questions/402083/enable-disable-ubuntu-desktop-environment-on-ubuntu-12-04-1-server-i386

http://askubuntu.com/questions/53822/how-do-you-run-ubuntu-server-with-a-gui