相关疑难解决方法(0)

有时，当我安装东西时，我会收到如下错误：

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 package1 : Depends: package2 (>= 1.8) but 1.7.5-1ubuntu1 is to be installed
E: Unable to correct problems, you have held broken packages.

我该如何解决这个问题？

在 Ubuntu 18.04 (Cinnamon) 中，软件包完全cpp-7取决于7.3.0-27ubuntu1~18.04软件包的版本gcc-7-base：

$ aptitude why gcc-7-base
i   cpp-7 Depends gcc-7-base (= 7.3.0-27ubuntu1~18.04)

同时，包完全libgfortran4取决于7.3.0-16ubuntu3相同包的版本gcc-7-base：

$ apt-cache show libgfortran4
Package: libgfortran4
...
Depends: gcc-7-base (= 7.3.0-16ubuntu3), libc6 (>= 2.27), libgcc1, libquadmath0

libgfortran4如果我已经安装了其他版本的软件包，则不会安装：

$ sudo apt-get install libgfortran4
...
The following packages have unmet dependencies:
 libgfortran4 : Depends: gcc-7-base (= 7.3.0-16ubuntu3) but 7.3.0-27ubuntu1~18.04 is to be installed
                Depends: libquadmath0 but it is not going to be installed …