sisyphus@sisyphus5-desktop:~$ g++ -v
The program 'g++' can be found in the following packages:
 * g++
 * pentium-builder
Try: sudo apt-get install <selected package>
sisyphus@sisyphus5-desktop:~$ 

##</code><code>##

sisyphus@sisyphus5-desktop:~$ 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++:i386 : Depends: cpp:i386 (>= 4:4.6.3-1ubuntu5) but it is not going to be installed
            Depends: gcc:i386 (>= 4:4.6.3-1ubuntu5) but it is not going to be installed
            Depends: g++-4.6:i386 (>= 4.6.3-1~) but it is not going to be installed
            Depends: gcc-4.6:i386 (>= 4.6.3-1~) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
sisyphus@sisyphus5-desktop:~$

##</code><code>##

sisyphus@sisyphus5-desktop:~$ sudo apt-get install pentium-builder
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package pentium-builder is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'pentium-builder' has no installation candidate
sisyphus@sisyphus5-desktop:~$ 

##</code><code>##

sisyphus@sisyphus5-desktop:~$ sudo apt-get install build-essential
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:
 build-essential : Depends: g++ (>= 4:4.4.3) but it is not installable
                   Depends: dpkg-dev (>= 1.13.5) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
sisyphus@sisyphus5-desktop:~$