16.04 上有软件更新，安装更新后，我无法轻松安装任何新软件包。它不再列出所需的其他软件包。例如：
apt-get install skype
The following packages have unmet dependencies:
skype : Depends: skype-bin
apt-get install skype skype-bin
The following packages have unmet dependencies:
skype-bin:i386 : Depends: libqtgui4:i386 (>= 4:4.8.0) but it is not going to be installed
apt-get install skype skype-bin libqtgui4:i386
The following packages have unmet dependencies:
libqtwebkit4:i386 : Depends: libqt4-opengl:i386 (>= 4:4.5.3) but it is not going to be installed
You get it....
过去，当我尝试时sudo apt-get install skype 它会列出额外的包。
现在 Aptitude :(有时 aptitude 工作正常，它会下载所有需要的）
sudo aptitude install skype
The following NEW packages will be installed:
libaudio2:i386{a} libdbusmenu-qt2:i386{a} libice6:i386{a} libmng2:i386{a}
libmysqlclient20:i386{a} libqt4-dbus:i386{a} libqt4-declarative:i386{a}
libqt4-network:i386{a} libqt4-opengl:i386{a} libqt4-script:i386{a}
libqt4-sql:i386{a} libqt4-sql-mysql:i386{a} libqt4-xml:i386{a}
libqt4-xmlpatterns:i386{a} libqtcore4:i386{a} libqtdbus4:i386{a}
libqtgui4:i386{a} libqtwebkit4:i386{a} libsm6:i386{a} lbuuid1:i386{ab}
libxss1:i386{a} libxt6:i386{a} libxv1:i386{a} mysql-common{a}
qt-at-spi:i386{a} skype skype-bin:i386{a} sni-qt:i386{a}
0 packages upgraded, 28 newly installed, 0 to remove and 10 not upgraded.
Need to get 41.9 MB/42.0 MB of archives. After unpacking 124 MB will be used.
The following packages have unmet dependencies:
libuuid1 : Breaks: libuuid1:i386 (!= 2.27.1-6ubuntu3.1) but 2.27.1-6ubuntu3 is to be installed.
libuuid1:i386 : Breaks: libuuid1 (!= 2.27.1-6ubuntu3) but 2.27.1-6ubuntu3.1 is installed.
The following actions will resolve these dependencies:
Keep the following packages at their current version:
1) libaudio2:i386 [Not Installed]
2) libdbusmenu-qt2:i386 [Not Installed]
3) libqt4-declarative:i386 [Not Installed]
4) libqt4-opengl:i386 [Not Installed]
5) libqtgui4:i386 [Not Installed]
6) libqtwebkit4:i386 [Not Installed]
7) libsm6:i386 [Not Installed]
8) libuuid1:i386 [Not Installed]
9) libxt6:i386 [Not Installed]
10) qt-at-spi:i386 [Not Installed]
11) skype [Not Installed]
12) skype-bin:i386 [Not Installed]
13) sni-qt:i386 [Not Installed]
Leave the following dependencies unresolved:
14) skype-bin:i386 recommends sni-qt:i386
Accept this solution? [Y/n/q/?] Y
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 10 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.
不会安装、升级或删除任何软件包。什么为什么？
好的，现在不用 Y 了，然后降级一个包。
Accept this solution? [Y/n/q/?] n
The following actions will resolve these dependencies:
Downgrade the following packages:
1) libuuid1 [2.27.1-6ubuntu3.1 (now) -> 2.27.1-6ubuntu3 (xenial)]
现在它可以工作了，降级后它可以下载所有内容。
更新：我清除了 Skype。它似乎sudo apt-get install skype -f也能正常工作。它不应该像往常一样默认推荐/建议软件包吗？