我正在尝试将我的 ubuntu 20.10 系统更新到 21.04。当我运行sudo do-release-upgrade -d它时，它会中止并显示以下日志。我也尝试过使用软件更新程序 UI，但它也失败了。
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,269 kB]
Fetched 1,270 kB in 0s (0 B/s)
authenticate 'hirsute.tar.gz' against 'hirsute.tar.gz.gpg'
extracting 'hirsute.tar.gz'
Reading cache
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://lk.archive.ubuntu.com/ubuntu groovy InRelease
Hit http://security.ubuntu.com/ubuntu groovy-security InRelease
Hit http://lk.archive.ubuntu.com/ubuntu groovy-updates InRelease
Hit http://lk.archive.ubuntu.com/ubuntu groovy-backports InRelease
Fetched 0 B 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``