我正在从 Ubuntu 18.04 升级到 Ubuntu 20.04，这是我得到的结果：
E: The package python3 needs to be reinstalled, but I can't find an archive for it.
这是的输出sudo apt --dry-run install --reinstall python3=3.8.2-0ubuntu2；
[sudo] password for ha:
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: The package python3 needs to be reinstalled, but I can't find an archive for it.