AppStream cache update completed, but some metadata was ignored due to errors.
Reading package lists... Error!
E: Failed to fetch store:/var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_xenial-security_universe_dep11_icons-64x64.tar.gz  Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_xenial-security_main_binary-amd64_Packages
E: The package lists or status file could not be parsed or opened.