root@box:/# apt-get install unrar
Reading Package Lists... Done
Building Dependency Tree... Done
unrar is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@box:/# apt-get -f install
Reading Package Lists... Done
Building Dependency Tree... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@box:/#
Shown above is what I get for install command.

root@box:/$ apt-cache search unrar
unrar - Extract, test and view RAR archives
Shown above is what I get for apt-cache search <pkgname> command.

What now ?? Still the same error because I dont know the place to get libstdc++.so.6 :-s