When trying to update from the AppCenter I get this error, with the text "This may have been caused by external, manually added software repositories or a corrupted sources file."
These are the details:
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:56 and /etc/apt/sources.list.d/appcenter.list:1
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:56 and /etc/apt/sources.list.d/appcenter.list:1
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:56 and /etc/apt/sources.list.d/appcenter.list:1
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:56 and /etc/apt/sources.list.d/appcenter.list:1
W: Target Translations (main/i18n/Translation-pt) is configured multiple times in /etc/apt/sources.list:56 and /etc/apt/sources.list.d/appcenter.list:1
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:56 and /etc/apt/sources.list.d/appcenter.list:1
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:56 and /etc/apt/sources.list.d/appcenter.list:1
E: http://pt.archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 DEP-11 Metadata is not (yet) available (Could not open file /var/lib/apt/lists/partial/pt.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.gz - open (13: Permission denied))
E: http://pt.archive.ubuntu.com/ubuntu xenial-backports/main DEP-11 64x64 Icons is not (yet) available (Could not open file /var/lib/apt/lists/partial/pt.archive.ubuntu.com_ubuntu_dists_xenial-backports_main_dep11_icons-64x64.tar.gz - open (13: Permission denied))
Before I have had problems trying to update both from the AppStore and terminal, but it was, according to the help I got, with the kxstudio-debian and nathandyer/vocal-daily.
Can you please help me solve this?
Thank you in advance.