这是我通过 SSH（无控制台 - 远程）登录时，这是Ubuntu 18.04 Bionic。我已经重新启动了很多次，我做了do-release-upgrade，它说我应该升级到Xenial吗？怎么来的？2-3 年前，我从14.04升级到16.04，然后从16.04升级到18.04，所以现在，我在18.04，然后它仍然说我应该升级到Xenial作为sudo apt-get install linux-generic-lts-xenial
我的输出是这样的：
Welcome to Ubuntu 18.04 LTS (GNU/Linux 4.15.0-20-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
System information as of Tue May 8 16:31:20 CEST 2018
System load: 0.0
Usage of /: 42.8% of 109.88GB
Memory usage: 39%
Swap usage: 1%
Processes: 264
Users logged in: 0
IP address …