update-manager --devel-release
			

$ sudo do-release-upgrade

$ lsb_release -a
			

升级到最新开发版

vim /etc/update-manager/release-upgrades 文件，把里面的
Prompt=lts
改为
Prompt=normal
			

sudo do-release-upgrade -d
			

$ sudo mount -t iso9660 -o loop ~/maverick-alternate-i386.iso /cdrom
$ sudo /cdrom/cdromupgrade