转自：Ubuntu14.04升级到18.04
lsb_release -a
apt-get update apt-get upgrade apt dist-upgrade
reboot
do-release-upgrade
注：升级会从14.04升级到16.04,然后再从14.04升级到18.04
Ubuntu系统升级
原文：https://www.cnblogs.com/darange/p/13708746.html
