当我尝试此命令进行升级时
~$ sudo do-release-upgrade -d
我得到了这个结果，但无法升级我的系统。这背后有什么原因吗？？
因为我的声誉较低，所以我无法显示完整的结果
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,258 kB]
Fetched 1,258 kB in 0s (0 B/s)
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg'
extracting 'bionic.tar.gz'
Reading cache
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Ign http://dl.google.com/linux/chrome/deb stable InRelease
Hit http://ppa.launchpad.net/deadsnakes/ppa/ubuntu xenial InRelease
Hit http://dl.google.com/linux/chrome/deb stable Release
Hit http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit http://bd.archive.ubuntu.com/ubuntu xenial InRelease
Hit http://ppa.launchpad.net/embrosyn/cinnamon/ubuntu xenial InRelease
Hit http://bd.archive.ubuntu.com/ubuntu xenial-updates InRelease
Get:1 http://bd.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]
Fetched 125 kB in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done