do-release-upgrade
如果出现以下提示：
Checking for a new Ubuntu release
Please install all available updates for your release before upgrading.
可以用以下命令进行修复：（依次执行即可）
sudo apt-get update
sudo apt-get upgrade -y
sudo apt-get dist-upgrade
然后再执行升级命令进行升级即可
sudo do-release-upgrade
转载请注明：Done.cc » Ubuntu升级版本