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scott@lianli:~$ sudo apt-get autoremove

Reading package lists... Done

Building dependency tree      

Reading state information... Done

You might want to run 'apt-get -f install' to correct these.

The following packages have unmet dependencies:

 tcptraceroute:i386 : Depends: libpcap0:i386 (< 0.7.0) but it is not installable

                      Depends: libpcap0:i386 (>= 0.6.1-1) but it is not installable

W: Duplicate sources.list entry http://archive.canonical.com/ubuntu/ precise/partner amd64 Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_precise_partner_binary-amd64_Packages)

W: Duplicate sources.list entry http://archive.canonical.com/ubuntu/ precise/partner i386 Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_precise_partner_binary-i386_Packages)

W: You may want to run apt-get update to correct these problems

E: Unmet dependencies. Try using -f.