Thanks to take time to report an issue in Ubuntu.
It seems that you have some wrong character at the beginning of the line 56 of
your sources.list file (the “ one).
Can you correct the file, and check if it's working?
** Changed in: ubuntu
Status: New => Incomplete
** Changed in: update-manager (Ubuntu)
Sourcepackagename: None => update-manager
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update-manager
https://bugs.launchpad.net/bugs/270771
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