how do I update my mint 15 with this error message? [on hold]

how do I update my mint 15 with this error message? [on hold]

I can't update my Linux mint 15, this is the message i
get:ERROR###ERROR###ERROR###ERROR###ERROR###ERROR###ERROR E:Encountered a
section with no Package: header, E:Problem with MergeList
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_di