为什么我不能安装 libpq-dev

Question

我尝试sudo apt-get install libpq-dev并收到此错误

Reading package lists... Done
Building dependency tree       
Reading state information... Done
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:
 libpq-dev : Depends: libssl-dev but it is not going to be installed
             Depends: krb5-multidev but it is not going to be installed
             Depends: comerr-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

我也运行这个命令apt-cache policy libpq-dev libssl-dev krb5-multidev comerr-dev，这是结果

libpq-dev:
  Installed: (none)
  Candidate: 9.3.4-1
  Version table:
     9.3.4-1 0
    500 http://sd.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
libssl-dev:
  Installed: (none)
  Candidate: 1.0.1f-1ubuntu2
  Version table:
     1.0.1f-1ubuntu2 0
        500 http://sd.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
krb5-multidev:
  Installed: (none)
  Candidate: 1.12+dfsg-2ubuntu4
  Version table:
     1.12+dfsg-2ubuntu4 0
        500 http://sd.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
comerr-dev:
  Installed: (none)
  Candidate: 2.1-1.42.9-3ubuntu1
  Version table:
     2.1-1.42.9-3ubuntu1 0
        500 http://sd.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

输出 sudo apt-get install libssl-dev krb5-multidev comerr-dev

Reading package lists... Done
Building dependency tree       
Reading state information... Done
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:
 comerr-dev : Depends: libcomerr2 (= 1.42.9-3ubuntu1) but 1.42.9-3ubuntu1.2 is to be installed
 krb5-multidev : Depends: libkrb5-3 (= 1.12+dfsg-2ubuntu4) but 1.12+dfsg-2ubuntu5.1 is to be installed
                 Depends: libk5crypto3 (= 1.12+dfsg-2ubuntu4) but 1.12+dfsg-2ubuntu5.1 is to be installed
                 Depends: libgssapi-krb5-2 (= 1.12+dfsg-2ubuntu4) but 1.12+dfsg-2ubuntu5.1 is to be installed
 libssl-dev : Depends: libssl1.0.0 (= 1.0.1f-1ubuntu2) but 1.0.1f-1ubuntu2.15 is to be installed
              Recommends: libssl-doc but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

我能做些什么来解决这个问题？

Answer 1

正如我在这里和你的问题中看到的，你有一些（手动？）安装的软件包与 Ubuntu 标准存储库中的软件包冲突。您想要安装的软件包需要完全符合所需版本的依赖项。

运行以下命令：

sudo apt-get update
sudo apt-get install libssl1.0.0=1.0.1f-1ubuntu2 ibcomerr2=1.42.9-3ubuntu1

降低他们每个人的等级。

对于其他软件包，您必须启用trusty-security和（使用从此处trusty-updates获取的小脚本）。该软件包包含比已安装版本更高的版本。

sudo apt-get install git
git clone https://github.com/kos0/addRemoveDistribution.git
cd addRemoveDistribution

sudo ./enableDisableDistribution.pl enable security
sudo ./enableDisableDistribution.pl enable updates

在那之后

sudo apt-get update
sudo apt-get install libpq-dev