*** This bug is a duplicate of bug 156778 ***
https://bugs.launchpad.net/bugs/156778
Thanks for your bugreport.
Your /etc/apt/sources.list seems to be incorrect and causes this error.
** This bug has been marked a duplicate of bug 156778
[Master] update-manager gives useless error message for invalid sources.list
lines
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missing upgrade files gutsy amd64
https://bugs.launchpad.net/bugs/157231
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