Upgrade from natty to oneiric on amd64 using cdromupgrade fails when fetching index files from CD

[Ori Avtalion]

When upgrading from natty to oneiric using the "cdromupgrade" script provided in the alternate CD, the following errors are printed:

W:Failed to fetch cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111011)/dists/oneiric/main/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, W:Failed to fetch cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111011)/dists/oneiric/restricted/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
, E:Some index files failed to download. They have been ignored, or old ones used instead.

The process then exits.

This seems related to the multiarch dpkg changes in oneiric.

Oddly enough, after the first time I got the message, I tried running the script again, and it worked fine (I cancelled it later when it was downloading packages). On every later re-run, it failed on the same error.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Phi (ladyphi)]

I'm upgrading from the amd64 alternate .iso downloaded via torrent and mounted. I get this error when I choose "Yes" to updating from network sources, but not if I choose "No".

[Alessandro Menti (elgaton)]

Agree with Phi - just upgraded from Natty to Oneiric using a variation of his method.