*** This bug is a duplicate of bug 156778 ***
https://bugs.launchpad.net/bugs/156778
You could remove the cdrom source with the software-propoerties tool to
continue with the upgrade. But it does sounds like there is a problem
with the CD (scratch, bad burn)?
** 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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Faild to fetch cdrom
https://bugs.launchpad.net/bugs/157238
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