[How-to] Fix “E: Unable to parse package file /var/lib/apt/extended_states (1)” error in Synaptic or apt-get

This is just a quick tip. If you are getting this error message in Synaptic: E: Unable to parse package file /var/lib/apt/extended_states (1) E: _cache->open() failed, please report or this error in apt-get in command line: Reading package lists… Done Building dependency tree Reading state information… Error! E: Unable to parse package file /var/lib/apt/extended_states (1)…