Unable to upgrade "commercial/binary-i386/Packages"

[Linarès Gabriel]

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DESCRIPTION
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After downloading the upgrade files during the standard upgrade process, the release updater is unable to recover the entry «commercial/binary-i386/Packages» expected in the file «Release» for any source in the "sources.list" file. After this, the release upgrader chooses to keep the old installed files instead.

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RELEVANT DETAILS
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The release upgrader suggests this bug is due to two possible reasons:
1. A missing line in sources.list
2. sources.list is corrupted

DistroRelease: Ubuntu 12.04

[Alberto Salvia Novella (es20490446e)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. Could you please add the log files from '/var/log/dist-upgrade/' to this bug report as separate attachments (not pasted into comments or tar/zip-ed)? Thanks in advance.

[Alberto Salvia Novella (es20490446e)]

It will also be useful if you can execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect BUGNUMBER
When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]