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I haven't been able to update my Ubuntu 16.04 machine for the past month because of this error. When I click to view the details, I get 

W:Target Sources (main/source/Sources) is configured multiple times in
/etc/apt/sources.list.d/gerardpuig-ubuntu-ppa-xenial.list:2 and
/etc/apt/sources.list.d/gerardpuig-ubuntu-ppa-xenial.list:3, 
W:The repository 'cdrom://Ubuntu 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215.2) xenial Release' does not have a Release file., 
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., 
W:See apt-secure(8) manpage for repository creation and user configuration details., 
W:The repository http://ppa.launchpad.net/noobslab/deepin-sc/ubuntu xenial Release' does not have a Release file., 
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., 
W:See apt-secure(8) manpage for repository creation and user configuration
details., 
E:Failed to fetch cdrom://Ubuntu 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215.2)/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:Failed to fetch http://ppa.launchpad.net/noobslab/deepin-sc/ubuntu/dists/xenial/main/source/Sources 404  Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead.

Can you tell me what I possibly did wrong or what I can do to resovle this?

George Udosen
  • 36,677
Mikey
  • 71

1 Answers1

1

I am going to offer several solutions:

  1. To get rid of the cdrom error see here

  2. For the error:

    W:Target Sources (main/source/Sources) is configured multiple times in
/etc/apt/sources.list.d/gerardpuig-ubuntu-ppa-xenial.list:2 and
/etc/apt/sources.list.d/gerardpuig-ubuntu-ppa-xenial.list:3`

      1. Open /etc/apt/sources.list.d/gerardpuig-ubuntu-ppa-xenial.list and remove the duplicate entries for that repo there or just add # in front of one of the entry. 

        sudo nano /etc/apt/sources.list.d/gerardpuig-ubuntu-ppa-xenial.list

  3. To fix this error The repository http://ppa.launchpad.net/noobslab/deepin-sc/ubuntu xenial Release' does not have a Release file.,

      1. remove the repo with:

        sudo add-apt-repository -r ppa:noobslab/deepin-sc

  4. After that run sudo apt update then sudo apt dist-upgrade

George Udosen
  • 36,677
  • Thank you! I completed step 2, but for step 1, I get: "bash: /etc/apt/sources.list.d/gerardpuig-ubuntu-ppa-xenial.list: Permission denied." Any ideas? I also tried to put "sudo" and "su" in front of it. Same result. – Mikey Jul 10 '17 at 13:23
  • Please do so from the system settings area as seen in those posts – George Udosen Jul 10 '17 at 14:33
  • try sudo vi /etc/apt/sources.list.d/gerardpuig-ubuntu-ppa-xenial.list – Dawoodjee Jun 26 '18 at 06:57