2012.12.20 dist-upgrade

$ sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
W: Duplicate sources.list entry http://ftp.ccc.uba.ar/pub/linux/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/ftp.ccc.uba.ar_pub_linux_ubuntu_dists_precise_main_binary-i386_Packages)
W: Duplicate sources.list entry http://ftp.ccc.uba.ar/pub/linux/ubuntu/ precise/restricted i386 Packages (/var/lib/apt/lists/ftp.ccc.uba.ar_pub_linux_ubuntu_dists_precise_restricted_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems