最近，我彻底清除了旧磁盘数据并安装了 20.04 LTS 版本的 Ubuntu。但是，Ubuntu 软件无法正常工作。我甚至无法安装该软件。请参考以下内容：为什么 Ubuntu 软件中没有出现类别项目？
因此，我尝试按照以下步骤重新安装 Ubuntu 软件文件，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 missing, has been obsoleted, or
is only available from another source
E: Package 'software-center' has no installation candidate
+ 更新-1
已安装的pkgs：
ii appstream 0.12.10-2 amd64 Software component metadata management
ii brltty 6.0+dfsg-4ubuntu6 amd64 Access software for a blind person using a braille display
ii docbook-xml 4.5-9 all standard XML documentation system for software and systems
ii espeak-ng-data:amd64 1.50+dfsg-6 amd64 Multi-lingual software speech synthesizer: speech data files
ii gnome-software 3.36.0-0ubuntu3 amd64 Software Center for GNOME
ii gnome-software-common 3.36.0-0ubuntu3 all Software Center for GNOME (common files)
ii gnome-software-plugin-snap 3.36.0-0ubuntu3 amd64 Snap support for GNOME Software
ii libdv4:amd64 1.0.0-12 amd64 software library for DV format digital video (runtime lib)
ii libespeak-ng1:amd64 1.50+dfsg-6 amd64 Multi-lingual software speech synthesizer: shared library
ii libqpdf26:amd64 9.1.1-1build1 amd64 runtime library for PDF transformation/inspection software
ii libtss2-esys0 2.3.2-1 amd64 TPM2 Software stack library - TSS and TCTI libraries
ii python3-software-properties 0.98.9 all manage the repositories that you install software from
ii software-properties-common 0.98.9 all manage the repositories that you install software from (common)
ii software-properties-gtk 0.98.9 all manage the repositories that you install software from (gtk)
ii xbrlapi 6.0+dfsg-4ubuntu6 amd64 Access software for a blind person using a braille display - xbrlapi
+更新-2
快照列表：
Name Version Rev Tracking Publisher Notes
chromium 81.0.4044.122 1123 latest/stable canonical✓ -
core18 20200311 1705 latest/stable canonical✓ base
gimp 2.10.18 252 latest/stable snapcrafters -
gnome-3-28-1804 3.28.0-16-g27c9498.27c9498 116 latest/stable canonical✓ -
gnome-3-34-1804 0+git.2c86692 27 latest/stable/… canonical✓ -
gtk-common-themes 0.1-36-gc75f853 1506 latest/stable/… canonical✓ -
libreoffice 6.4.3.2 177 latest/stable canonical✓ -
snap-store 3.36.0-74-ga164ec9 433 latest/stable/… canonical✓ -
snapd 2.44.3 7264 latest/stable canonical✓ snapd
答案1
安装
您可以安装Ubuntu 软件像这样：
sudo apt install ubuntu-software
或安装Gnome 软件在Ubuntu 的新版本像这样：
sudo apt install gnome-software
重新安装
您可以重新安装Ubuntu 软件像这样：
sudo apt install --reinstall ubuntu-software
或重新安装Gnome 软件在Ubuntu 的新版本像这样：
sudo apt install --reinstall gnome-software
重置
您可以重置Ubuntu 软件恢复其原始设置。
第一的，像这样清除它：
sudo apt purge ubuntu-software
然后，像这样安装：
sudo apt install ubuntu-software
或重置Gnome 软件在Ubuntu 的新版本。
第一的，像这样清除它：
sudo apt purge gnome-software
然后，像这样安装：
sudo apt install gnome-software
注意
您可以删除Snap 商店可能已经安装（尽管我建议你保留它）像这样：
sudo snap remove snap-store
您可以安装Snap 商店再次像这样：
sudo snap install snap-store
答案2
我听说他们已经改用 snap store 了。你可以尝试一下这两种方式。
sudo apt-get update
sudo apt-get install gnome-software
或者
sudo apt-get update
sudo snap install snap-store
答案3
您可以尝试访问 snap 商店网站并从那里下载商店snap 商店