Ubuntu软件未显示任何软件

安装16.04之后，Ubuntu Software始终为空，如屏幕快照所示。我怎样才能解决这个问题？

在“ 软件和更新”中更改从服务器的下载。我把我的东西放在附近的瑞典那边（也许它本身还没有更新）。我改用看起来更正式的英国服务器，而Ubuntu软件现在可以使用了。

这很可能是因为新安装的系统缺少可用软件包的数据库。您可以按照以下步骤从软件包存储库中生成一个最新版本。

1. 打开一个终端。有很多方法可以实现这一目标，但是最常见的是

   • 输入terminal破折号并启动具有相同名称的应用程序或
   • 按Ctrl+ Alt+ T。

2. 将以下命令键入或复制并粘贴到终端中，然后运行它们：

   sudo apt update
   sudo apt upgrade -y
   

   （如果您在此过程中遇到任何错误，请打开一个新问题，并逐字包含这些命令的整个输出。）

3. 重新打开软件中心，然后重试。

如果sudo apt-get update && sudo apt-get upgrade重新启动后仍不能解决问题，我建议：

sudo apt-get dist-upgrade

重新开始。如果那没有帮助，您也可以尝试备份，然后在与该程序关联的主目录中删除一个文件夹。首先，在终端或其他CLI中：

killall gnome-software

然后

mv ~/.local/share/gnome-software{,-BAK}

重新打开Ubuntu软件。（如果需要，您可以随时撤消去除GNOME软件的文件夹，并恢复备份：rm -r ~/.local/share/gnome-software && mv ~/.local/share/gnome-software{-BAK,}）

最后，如果这些都不适合您，我将很想知道以下内容的输出：

find /etc/apt/ -name '*.list' -ls -exec cat {} \;

这是所有允许的来源的列表（来源是包含可下载的可用软件的存储库）。

尽管我想不出您为什么在source.list中什么都没有的任何原因，但这也是我能想到的，为什么在尝试了所有正常的故障排除步骤后，Ubuntu Software中什么都没有显示的唯一解释。

上面命令的示例输出：

  1234567      4 -rw-r--r--   1 root     root         3026 Apr  8 22:39 /etc/apt/sources.list
# deb cdrom:[Ubuntu 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719)]/ xenial main multiverse restricted universe

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ xenial main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://us.archive.ubuntu.com/ubuntu/ xenial universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial universe
deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ xenial multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
## deb http://archive.canonical.com/ubuntu xenial partner
## deb-src http://archive.canonical.com/ubuntu xenial partner

deb http://security.ubuntu.com/ubuntu xenial-security main restricted
# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb http://security.ubuntu.com/ubuntu xenial-security universe
# deb-src http://security.ubuntu.com/ubuntu xenial-security universe
deb http://security.ubuntu.com/ubuntu xenial-security multiverse
# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse

在上面的示例中，启用了四个主要存储库。

1. 主要-规范支持的免费和开源软件。
2. Universe-社区维护的免费和开源软件。
3. 受限-设备的专有驱动程序。
4. Multiverse-受版权或法律问题限制的软件。

还启用了更新。未启用Canonical合作伙伴的软件回购。这些代表首次安装Ubuntu时启用的标准选项。

如果您添加了任何PPA，它们也将出现在上面的输出中。

如果上述方法不起作用，请尝试重新安装Gnome软件，这对我有用

sudo apt autoremove gnome-software && sudo apt install gnome-software