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I get the following error running apt-get update:

W: The repository 'cdrom://Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1) xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch cdrom://Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)/dists/xenial/main/binary-amd64/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.

How should I proceed?

Fabby
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Dhruv Patel
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    Try this: Open "Software and Updates" and look at the "Ubuntu Software" tab. Down at the bottom, if the CD-ROM box is ticked, untick it, and try again. – Organic Marble Jul 21 '16 at 15:50
  • There are no packages included in the Ubuntu live DVD´s. A live DVD is an image of an installed OS. – Knud Larsen Jul 21 '16 at 16:16

1 Answers1

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It looks like you are trying to use a CD as a repository. You can't do that in this way, because the CD doesn't have the necessary structure. If you want to make a CD accessible to APT, you have to use apt-cdrom. You can find further information on apt-cdroms man page

man apt-cdrom

And, no offence meant, but the error messages you quoted in your question literally tell you just that:

Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

Henning Kockerbeck
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