常规升级命令：
$ sudo do-release-upgrade
cat /etc/os-release
查看系统版本
如果如下问题，那么访问链接地址：https://www.helplib.com/ubuntu/article_155630
Checking for a new Ubuntu release
No new release found
通过设置开关变量来更新
$ sudo do-release-upgrade -d
$ sudo do-release-upgrade -p
-d, --devel-release
Check if upgrading to the latest devel release is possible
-p, --proposed
Try upgrading to the latest release using the upgrader from Ubuntu-proposed
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