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libstdc++6 is already the newest version.
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:
 libstdc++6-4.5-dbg : Conflicts: libstdc++6-4.4-dbg but 4.4.7-2ubuntu1 is to be installed
 libstdc++6-4.5-doc : Conflicts: libstdc++6-4.4-doc but 4.4.7-2ubuntu1 is to be installed
 libstdc++6-4.6-dbg : Conflicts: libstdc++6-4.4-dbg but 4.4.7-2ubuntu1 is to be installed
                      Conflicts: libstdc++6-4.5-dbg but 4.5.4-1ubuntu2 is to be installed
 libstdc++6-4.6-doc : Conflicts: libstdc++6-4.4-doc but 4.4.7-2ubuntu1 is to be installed
                      Conflicts: libstdc++6-4.5-doc but 4.5.4-1ubuntu2 is to be installed
 libstdc++6-4.7-dbg : Conflicts: libstdc++6-4.4-dbg but 4.4.7-2ubuntu1 is to be installed
                      Conflicts: libstdc++6-4.5-dbg but 4.5.4-1ubuntu2 is to be installed
                      Conflicts: libstdc++6-4.6-dbg but 4.6.3-10ubuntu1 is to be installed
 libstdc++6-4.7-dbg-armel-cross : Conflicts: libstdc++6-4.6-dbg-armel-cross but 4.6.3-8ubuntu1cross1.67 is to be installed
 libstdc++6-4.7-dbg-armhf-cross : Conflicts: libstdc++6-4.6-dbg-armhf-cross but 4.6.3-8ubuntu1cross1.67 is to be installed
 libstdc++6-4.7-doc : Conflicts: libstdc++6-4.4-doc but 4.4.7-2ubuntu1 is to be installed
                      Conflicts: libstdc++6-4.5-doc but 4.5.4-1ubuntu2 is to be installed
                      Conflicts: libstdc++6-4.6-doc but 4.6.3-10ubuntu1 is to be installed