$ apt-cache search libstdc++
libgmp3-dev - Multiprecision arithmetic library developers tools
libstdc++5 - The GNU Standard C++ Library v3
libstdc++5-3.3-dev - The GNU Standard C++ Library v3 (development files)
libstdc++6 - The GNU Standard C++ Library v3
libstdc++6-4.1-dbg - The GNU Standard C++ Library v3 (debugging files)
libstdc++6-4.1-dev - The GNU Standard C++ Library v3 (development files)
libstdc++6-4.1-doc - The GNU Standard C++ Library v3 (documentation files)
mkrueger@hawmyth:~$ apt-get install libstdc++6
E: Could not open lock file /var/lib/dpkg/lock - open (13 Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?
mkrueger@hawmyth:~$ sudo apt-get install libstdc++6
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libstdc++6 is already the newest version.
You might want to run `apt-get -f install' to correct these:
The following packages have unmet dependencies:
  nxclient: Depends: libstdc++2.10-glibc2.2 but it is not installable
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).