Encountered a section with no Package: header

Полный текст ошибки:

Reading package lists... Error!
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/backports.debian.org_debian-backports_dists_squeeze-backports_main_binary-amd64_Packages
E: The package lists or status file could not be parsed or opened.

Решение:

sudo rm /var/lib/apt/lists/* -vf
sudo apt-get update