查找 g++ 程序时出现问题，尽管已安装

Question

gcc version 5.3.0 20151204 (Ubuntu 5.3.0-3ubuntu1~14.04) 

我的 g++ 有问题

当我搜索 g++ 时，我什么也没找到！

所以我尝试安装它；看起来 g++ 已经安装了，而且是最新的！

arubu@CQ56-LinuxMachine:~$ which g++
arubu@CQ56-LinuxMachine:~$ sudo apt-get install g++
[sudo] password for arubu: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
g++ is already the newest version.
g++ set to manually installed.
The following packages were automatically installed and are no longer required:
  libgranite-common libgranite1 libkeybinder-3.0-0
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 8 not upgraded.
arubu@CQ56-LinuxMachine:~$ g++ -v
The program 'g++' is currently not installed. You can install it by typing:
sudo apt-get install g++

Answer 1

您应该强制重新安装该g++软件包；这将恢复适当的符号链接：

sudo apt-get --reinstall install g++

完成此操作后，您应该会发现/usr/bin/g++再次存在并且是 的符号链接g++-5。

Answer 2

这/usr/bin/g++是指向真正可执行文件的符号链接/usr/bin/x86_64-linux-gnu-g++。我猜你的符号链接丢失了。尝试看看后一个文件是否存在，但前一个文件不存在。然后您可以通过发出手动修复它sudo ln -sv /usr/bin/X86_64-linux-gnu-g++ /usr/bin/g++。

这个答案摘自这里。