Updating from Freya to wily is quite annoying at this point. I'm somewhat a newbie to Linux, but when I run update commands in terminal or software update I get the following:

W:Failed to fetch_http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/trusty/main/binary-amd64/Packages/dists/trusty/main/source/Sources  404  Not Found

W:Failed to fetch_http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/trusty/main/binary-amd64/Packages/dists/trusty/main/binary-amd64/Packages  404  Not Found

 W:Failed to fetch_http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/trusty/main/binary-amd64/Packages/dists/trusty/main/binary-i386/Packages  404  Not Found

 W:Failed to fetch_http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu/dists/trusty/main/source/Sources  404  Not Found

 W:Failed to fetch_http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found

W:Failed to fetch_http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found

 E:Some index files failed to download. They have been ignored, or old ones used instead.
  • Maybe add the command you used to update or upgrade and get to this point.
    – Mrpopo666
    Commented May 4, 2016 at 7:16

2 Answers 2


Don't try to upgrade elementary OS Freya to Ubuntu 15.10. You will break your system since elementary hasn't released packages for Ubuntu 15.10.

If you want to upgrade Freya then wait for elementary OS Loki (based on Ubuntu 16.04) to be released.


Although elementary OS is based on Ubuntu, you must wait for elementary OS 0.4 (Loki) release. It's possible to add Ubuntu repositories, but you can destroy your Elementary.

  • Don't add duplicate answers.
    – Suici Doga
    Commented May 4, 2016 at 10:28

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