How to upgrade Ubuntu 14.04 / 15.10 to 16.04 LTS

upgrade Ubuntu

apt-get update

apt-get upgrade -y

apt-get dist-upgrade -y



apt-get install update-manager-core

do-release-upgrade



reboot

fix bug

if can’t pingout or ‘ifconfig’ show nothing.
or ‘reboot’ show
“Failed to connect to bus: No such file or directory”
“Failed to talk to init daemon.”

/etc/init.d/networking

apt-get install upstart 

apt-get install upstart-sysv

apt-get remove --purge --auto-remove systemd

apt-get clean

cat /etc/issue

lsb_release -a

uname -a