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 …