It's the first time that I use ubuntu and I can't use the ubuntu
software manager, when I type update codes in terminal it shows this error
Reading package lists... Error!
W: GPG error: http://ir.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <
[email protected]>
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/ir.archive.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.