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I am a new Ubuntu user running 14.04 LTS and I have a question that has been bugging me for 2 days.

This is the error I get when I use $ sudo apt-get update:

W:Failed to fetch cdrom://Ubuntu 14.04.4 LTS _Trusty Tahr_ - Release i386 (20160217.1)/buntu/dists/trusty/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
W:Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/Release  Unable to find expected entry 'restricted/source/Sources' in Release file (Wrong sources.list entry or malformed file)

I booted the OS via a USB stick and I have no bootable disc. This leads to other errors that make me unable to download/install any new applications via software center.

Please help a newbie out and thanks in advance!

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  • Can you copy the output of cat /etc/apt/sources.list? Maybe you have some wrong sources there
    – Motte001
    Apr 22, 2016 at 18:31
  • 1
    The first line says Ubuntu cannot find CDROM containing Ubuntu. You can remove CDROM as the source of update by going to your System Setting > Software & update. The second one is related to some problem in the sources.list file. May you update your post and share the result of cat /etc/apt/sources.list
    – Mostafa Ahangarha
    Apr 23, 2016 at 8:03
  • Let us know how you get on ... ?
    – Scott Stensland
    Apr 25, 2016 at 13:23

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