How to solve the problem that apt-get update cannot add new CD-ROM under Ubuntu
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I am experiencing Elementary OS Freya these days, during which time I encountered a very common update error: Failed to fetch cdrom Please use apt-cdrom to make this CD-ROM recognized by APT. Apt-get update cannot be used to add new CD-ROMs . The complete error looks like this after running apt-get update:
The code is as follows:
W: Failed to fetch cdrom://elementary OS 0.3 Freya-Daily amd64 (20150208) / dists/trusty/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
W: Failed to fetch cdrom://elementary OS 0.3 Freya-Daily amd64 (20150208) / dists/trusty/restricted/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.
In this article, we will learn how to fix this error.
Fixed a bug where apt-get update could not add a new CD-ROM
The reason for this error is that cdrom is already included in the source. To fix this problem, we need to remove it from the software source.
In Ubuntu, find "Software and updates":
In the first tab of Ubuntu Software, find cdrom, and if it is checked, uncheck it.
Close the software source and run the update again. It should be ready for use now.
Further troubleshooting:
The method described above has fixed this apt-get update cannot be used to add new CD-ROMs error. But this method doesn't work for me, because the option for cdrom is grayed out at this time, because I'm using the live version.
Now it's time to fix our problem, we're going to take the command line route. Open the terminal and see which sources are included in the software source:
The code is as follows:
Cat / etc/apt/sources.list
My output is as follows:
The code is as follows:
Deb cdrom: [elementary OS 0.3 _ Freya_-Daily amd64 (20150208)] / trusty main restricted
Deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
Deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
Deb http://security.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
Deb-src http://security.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
Deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
Deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
In the first line above. It contains cdrom. We need to comment out this line with'#':
The code is as follows:
# deb cdrom: [elementary OS 0.3 _ Freya_-Daily amd64 (20150208)] / trusty main restricted
To use the following command:
The code is as follows:
Sudo gedit / etc/apt/sources.list
After you have finished editing the software source, run apt-get update again. The "apt-get update cannot be used to add new CD-ROMs" bug should have been fixed. If you have any other problems, take a look at this article, which collects most of the common Ubuntu update bug fixes.
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