This isn't really a bug. You need to edit your /etc/apt/sources.list to
reduce the number of active entries and remove the duplicate entries.
If you need help doing that, the appropriate place to file a support
request is https://answers.launchpad.net/ubuntu/.
** Changed in: Ubuntu
Status: Unconfirmed => Rejected
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can not run upgrade'W:Duplicate sources.
https://bugs.launchpad.net/bugs/121190
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Bugs, which is the bug contact for Ubuntu.
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