从 16.04 升级后，我无法在 Ubuntu 18.04 系统上更新或安装新软件。
sudo apt-get update
返回...
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appstreamcli: error while loading shared libraries: libappstream.so.4: cannot open shared object file: No such file or directory
Reading package lists... Done
E: Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then appstreamcli refresh > /dev/null; fi'
E: Sub-process returned an error code
在过去的几个月里，我尝试了很多方法，比如手动安装这些东西，但是......
sudo apt install libappstream4
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
libappstream4 : Depends: libstemmer0d (>= 0+svn527) but it is not going to be installed
libdbus-1-dev : Depends: libdbus-1-3 (= 1.12.2-1ubuntu1.1) but 1.10.6-1ubuntu3.4 is to be installed
libgdk-pixbuf2.0-dev : Depends: gir1.2-gdkpixbuf-2.0 (= 2.36.11-2) but 2.32.2-1ubuntu1.6 is to be installed
Depends: libpng-dev (>= 1.6)
Depends: libpng-dev (< 1.7)
libglib2.0-bin : Depends: libglib2.0-0 (= 2.56.4-0ubuntu0.18.04.4) but 2.48.2-0ubuntu4.4 is to be installed
libglib2.0-dev : Depends: libglib2.0-0 (= 2.56.4-0ubuntu0.18.04.4) but 2.48.2-0ubuntu4.4 is to be installed
libproxy1-plugin-gsettings : Depends: libproxy1v5 (= 0.4.15-1) but 0.4.11-5ubuntu1 is to be installed
python3-distutils : Depends: python3 (>= 3.6.6-1~) but 3.5.1-3 is to be installed
python3-lib2to3 : Depends: python3 (>= 3.6.6-1~) but 3.5.1-3 is to be installed
systemd : Depends: libsystemd0 (= 229-4ubuntu21.22) but 237-3ubuntu10.29 is to be installed
udev : Depends: libudev1 (= 229-4ubuntu21.22) but 237-3ubuntu10.29 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
甚至 ....
apt-get -f install
无法解决我的问题
也不
sudo apt update
sudo apt-get update -y
https://zoomadmin.com/HowToInstall/UbuntuPackage/libappstream4
不久前，我通过终端命令从 16.0x 升级到了 18.04，一切正常，我没有安装很多软件，实际上几乎没有安装什么，除了更新 Apache 和 PHP。甚至 GNOME Shell GUI 也失败了。
怎么修？