无法安装 g++

Question

如何解决这个问题：

sahil@sahil-XPS-L501X ~ $ sudo apt-get install g++ 
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:  
g++ : Depends: gcc (>= 4:4.8.1-2ubuntu3) but it is not going to be installed
       Depends: g++-4.8 (>= 4.8.1-4~) but it is not going to be installed
       Depends: gcc-4.8 (>= 4.8.1-4~) but it is not going to be installed 
E: Unable to correct problems, you have held broken package

sahil@sahil-XPS-L501X ~ $ sudo apt-cache policy g++ gcc g++-4.8 gcc-4.8
g++:
  Installed: (none)
  Candidate: 4:4.8.1-2ubuntu3
  Version table:
     4:4.8.1-2ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
gcc:
  Installed: (none)
  Candidate: 4:4.8.1-2ubuntu3
  Version table:
     4:4.8.1-2ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
g++-4.8:
  Installed: (none)
  Candidate: 4.8.2-1ubuntu1
  Version table:
     4.8.2-1ubuntu1 0
        500 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/ saucy/main amd64 Packages
     4.8.1-10ubuntu9 0
        500 http://archive.ubuntu.com/ubuntu/ saucy-updates/main amd64 Packages
     4.8.1-10ubuntu8 0
        500 http://archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
gcc-4.8:
  Installed: (none)
  Candidate: 4.8.2-1ubuntu1
  Version table:
     4.8.2-1ubuntu1 0
        500 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/ saucy/main amd64 Packages
     4.8.1-10ubuntu9 0
        500 http://archive.ubuntu.com/ubuntu/ saucy-updates/main amd64 Packages
     4.8.1-10ubuntu8 0
        500 http://archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages

Answer 1

假设 debian 软件包出现问题，请尝试以下操作：

dpkg  -l|grep -v ^ii

这列出了所有未正确安装的软件包。

dpkg -P package

卸载（清除）受影响的软件包。

dpkg -P --force-all package

如果它仍然具有抵抗力，请尝试用力。

dpkg --configure -a

尝试刷新所有尚未配置的包。

apt-get update

在安装新软件包之前始终更新。

apt-get install package

现在应该可以了。