E:Encountered a section with no Package: header,,E:Problem with MergeList /var/lib/apt/lists /us.archive.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages, E:The package lists or status file could not be parsed or opened.

Problem :
E:Encountered a section with no Package: header,,E:Problem with MergeList /var/lib/apt/lists /us.archive.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages,
E:The package lists or status file could not be parsed or opened.

Probable Reason:

Installation process interrupted abruptly. or some important installation process not completed correctly.

Probable Solution:

Try following commands :

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