apt-get: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution)

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http://askubuntu.com – root@m-laptop:/home/m/Desktop# apt-get -f install libc6 Reading package lists... Done Building dependency tree Reading state information... Done libc6 is already the newest version. libc6 set to manually installed. You might want to run `apt-get -f install' to correct these: The following packages have unmet dependencies: virtualbox-4.1: Depends: libc6 (>= 2.11) but 2.9-4ubuntu6 is to be installed Depends: libcurl3 (>= 7.16.2-1) but it is not installable Depends: libpython2.7 (>= 2.7) but it is not installable Depends: lib (HowTos)