最近彻底清除了旧磁盘数据，安装了20.04 LTS版本的Ubuntu。但是，Ubuntu 软件无法正常工作。我什至无法安装该软件。请参考以下内容：为什么Ubuntu软件中没有出现类别项？
因此，我参考以下文档尝试重新安装Ubuntu软件，但出现以下错误：
Hit:1 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:2 http://kr.archive.ubuntu.com/ubuntu focal InRelease
Get:3 http://kr.archive.ubuntu.com/ubuntu focal-updates InRelease [89.1 kB]
Hit:4 http://kr.archive.ubuntu.com/ubuntu focal-backports InRelease
Get:5 http://kr.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [648 B]
Get:6 http://kr.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [2,000 B]
Fetched 91.8 kB in 2s (44.6 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package software-center is not available, but is referred to by another package.
This may mean that the package is …