I can’t software packages. Error says ‘This is a serious problem, report it to the developers’

E:Unable to parse package file /var/lib/apt/lists/ppa.launchpad.net_tsvetko.tsvetkov_trusty-backports_ubuntu_dists_xenial_main_binary-amd64_Packages (1), E:Unable to parse package file /var/lib/apt/lists/ppa.launchpad.net_tsvetko.tsvetkov_trusty-backports_ubuntu_dists_xenial_main_binary-i386_Packages (1), E:Unable to parse package file /var/lib/apt/lists/ppa.launchpad.net_tsvetko.tsvetkov_trusty-backports_ubuntu_dists_xenial_main_binary-all_Packages (1), E:Unable to parse package file /var/lib/apt/lists/ppa.launchpad.net_tsvetko.tsvetkov_trusty-backports_ubuntu_dists_xenial_main_i18n_Translation-en (1), W:You may want to run apt-get update to correct these problems, E:The package cache file is corrupted