How to change Ubuntu from Debian

#sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 40976EAF437D05B5
#sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3B4FE6ACC0B21F32

#vi /etc/apt/source.list

###### Ubuntu Main Repos
deb http://jp.archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse 
deb-src http://jp.archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse 

###### Ubuntu Update Repos
deb http://jp.archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse 
deb http://jp.archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse 
deb http://jp.archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse 
deb http://jp.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse 
deb-src http://jp.archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse 
deb-src http://jp.archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse 
deb-src http://jp.archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse 
deb-src http://jp.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse 

apt-get update

apt-get upgrade

apt-get dist-upgrade

reboot