arquivos em / var / lib / apt / lists
W: Duplicate sources.list entry http://us.archive.ubuntu.com/ubuntu/ trusty/multiverse amd64 Packages (/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_trusty_multiverse_binary-amd64_Packages)
W: Duplicate sources.list entry http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages (/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_trusty_main_binary-amd64_Packages)
W: Duplicate ...
...
W: You may want to run apt-get update to correct these problems
Mas, é claro, executar apt-get update apenas os reinstala! Como posso consertar isso?