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Having this error message when I upgrade:

Failed to fetch cdrom:[Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5)]/pool/main/d/dkms/dkms_2.2.0.3-1.1ubuntu1_all.deb File not found
Failed to fetch cdrom:[Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5)]/pool/main/f/fakeroot/fakeroot_1.18.4-2_amd64.deb File not found

How to resolve this?

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i have just tried installing updates one at a time and this seems to have worked –  Michael Franks Mar 2 '13 at 12:06

1 Answer 1

Assuming you are posting this "after" upgrading, not while "upgrading", type "Software Sources" in the dash, and in the second tab in it, that reads "Other Software", uncheck the first line "cdrom:[Ubuntu 12.10 Quantal Quetzal ....(and so on)" and close and then do a sudo apt-get update and sudo apt-get upgrade.

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