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I installed 10.04 today and immediately upgraded to 12.04 (Long story). Tried to install Ubuntu One and got this warning:

QUOTE W:Failed to fetch cdrom://Ubuntu 10.04.4LTS_Lucid Lynx_-Release i386 (20120214.2)/dists/lucidmain/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 10.04.4LTS_Lucid Lynx_-Release i386 (201214.2)/dists/lucid/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. UNQUOTE

I don't have a clue what this means nor do I know what to do. Any help available?

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Look at the following Line:

Failed to fetch cdrom://Ubuntu 10.04.4LTS_Lucid Lynx_-Release i386 (20120214.2)/dists/lucidmain/binary-i386/Packages 

Ubuntu tries to look for Software on a CD-ROM that does not exist. Please remove the old CD-ROM Repository from your repositories.

To do so, go to Settings -> Software & Updates (beyond System) Then, uncheck all CD-ROM repos.

Then run

sudo apt-get update

and retry reinstalling Ubuntu One.

If there is still no success, run the following command:

sudo nano /etc/apt/sources.list

Look for every line, that has to do with CD-ROM. Comment it out by adding a # at the start of the line.

For instance:

...
#deb cdrom: ....
...

Then, to save the file, press CTRL + O and then commit the file name with [ENTER]. Then, exit the command line editor with CTRL + X

After that, re-run

sudo apt-get update

and retry installing Ubuntu One.

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