@eie1
I see this in your list: jonathonf-ubuntu-python-3_6-xenial.list. Do try commenting it(/etc/apt/sources.list.d/jonathonf-ubuntu-python-3_6-xenial.list) out.
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@eie1 I see this in your list:
jonathonf-ubuntu-python-3_6-xenial.list. Do try commenting it(/etc/apt/sources.list.d/jonathonf-ubuntu-python-3_6-xenial.list) out.