在新笔记本电脑上，我安装了 Ubuntu 20.04，更改了Software & Updates接收有关 Ubuntu 新版本通知的选项。然后，当我运行时Software Updater，它建议升级到 21.04。我照做了。一切似乎都很好。
但从那时起，每次我运行时Software Updater，它都会不断要求我升级：
如果我再次要求升级，则过程开始：
一开始，一切看起来都很好：
但感觉，显然在“设置新的软件频道”期间：
最后一条消息显示大约一秒钟，然后消失，没有任何其他消息。有什么想法可能出错了吗？我如何才能获得有关更新程序崩溃原因的更多信息？
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在第一次升级期间，一切似乎都很好，我认为升级成功了。但lsb_release仍然提到 20.04。虽然apt update使用了hirsute存储库。看起来我的系统处于某种中间状态：
me@mine:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS (fossa-stantler X80)
Release: 20.04
Codename: focal
me@mine:~$ sudo apt update
[sudo] password for fgeorges:
Hit:1 http://archive.ubuntu.com/ubuntu hirsute InRelease
Get:2 http://archive.ubuntu.com/ubuntu hirsute-updates InRelease [109 kB]
Hit:3 http://archive.canonical.com/ubuntu hirsute InRelease
Get:4 http://archive.ubuntu.com/ubuntu hirsute-backports InRelease [101 kB]
Hit:5 https://download.docker.com/linux/ubuntu focal InRelease
Get:6 http://security.ubuntu.com/ubuntu hirsute-security InRelease [101 kB]
Fetched 310 kB in 1s (331 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
me@mine:~$ sudo apt upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
me@mine:~$ sudo apt full-upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.