I am not able to update my system for a long time. This is the failure text:
Failed to fetch http://packages.elementary.io/appcenter/dists/xenial/main/dep11/Components-amd64.yml Could not open file /var/lib/apt/lists/partial/packages.elementary.io_appcenter_dists_xenial_main_dep11_Components-amd64.yml.xz - open (13: Permission denied) [IP: 126.96.36.199 80] E: Some index files failed to download. They have been ignored, or old ones used instead.
How can I fix it?