Error saat update di ubuntu 11.04

Ubuntu saya selalu error saat di update atau saat buka synaptic...
error'a seperti ini,
di terminal,

Reading package lists... Error!
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/archive.offensive-security.com_dists_pwnsauce_main_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.



Penyelesaian dengan cara mudah and ga ribet hapus dulu aja semua isi file lists nya

$sudo rm /var/lib/apt/lists/* -R

dilanjutkan dengan perintah

$sudo apt-get update
$sudo apt-get upgrade

Selamat Mencoba