An unresolvable problem occurred while initializing the package information.
Please report this bug against the 'update-manager' package and include the following error message:
'E:Encountered a section with no Package: header, Eroblem with MergeList /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_natty_main_bina ry-i386_Packages, E:The package lists or status file could not be parsed or opened.'
what should i do? i have to fix before the morning.