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I recently installed Ubuntu 16.04 in my machine, however when trying to perform sudo apt-get update I got the following message:

W: The repository 'http://ppa.launchpad.net/freyja-dev/unity-tweak-tool-daily/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: Failed to fetch https://deb.opera.com/opera-stable/dists/stable/InRelease  Connection timed out after 120000 milliseconds
E: Failed to fetch http://ppa.launchpad.net/freyja-dev/unity-tweak-tool-daily/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
W: Some index files failed to download. They have been ignored, or old ones used instead.

After some research I thought it would be useful to change my download mirror, however after selecting the recommended mirror and trying to update I get the error message:

Failed to download repository information.Check your Internet connection.

with the following details:

  W:The repository 'http://ppa.launchpad.net/freyja-dev/unity-tweak-tool-daily/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., 
W:Failed to fetch https://deb.opera.com/opera-stable/dists/stable/InRelease  Connection timed out after 120000 milliseconds
E:Failed to fetch http://ppa.launchpad.net/freyja-dev/unity-tweak-tool-daily/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found 
W:Some index files failed to download. They have been ignored, or old ones used instead.

Any idea how I might solve this problem? Thanks in advance.

João Mexia
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    The problem is the PPAs mentioned in the error message, not the official repositories mirror. Either disable or remove them altogether. Changing the mirror has no impact whatsoever. –  Oct 14 '16 at 12:20
  • Both answers were useful! Problem solved, thanks for your help. – João Mexia Oct 14 '16 at 12:35

1 Answers1

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The problem is the PPAs mentioned in the error message, not the official repositories mirror:

https://deb.opera.com/opera-stable/dists/stable/InRelease

http://ppa.launchpad.net/freyja-dev/unity-tweak-tool-daily/ubuntu/dists/xenial/main/binary-amd64/Packages

Either disable or remove them altogether. Changing the mirror has no impact whatsoever.

Additional information: How can I fix a 404 Error when using a PPA or updating my package lists?

Community
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