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I get this error when I try to update my Ubuntu 16.04. I already tried few solutions but nothing worked so far.

Error:

W: http://archive.canonical.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dists/precise-security/InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: GPG error: http://extras.ubuntu.com/ubuntu precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
W: The repository 'http://extras.ubuntu.com/ubuntu precise Release' is not signed.
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: http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dists/precise-backports/InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: The repository 'http://ppa.launchpad.net/upubuntu-com/network/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.
E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/network/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

After un-checking few of unwanted packages/repositories from software and update section, I managed to get rid of few of the errors but still few errors are still existing:

 The repository 'http://ppa.launchpad.net/upubuntu-com/network/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: http://archive.canonical.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
 E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/network/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
 E: Some index files failed to download. They have been ignored, or old ones used instead.

After applying the solution provided below( by Raphael),most errors got resolved. Except these errors:

 W: The repository 'http://ppa.launchpad.net/upubuntu-com/network/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.
 E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/network/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
 E: Some index files failed to download. They have been ignored, or old ones used instead.

marked as duplicate by Mark Kirby, Anwar, Eric Carvalho, Zanna, Kevin Bowen Nov 8 '16 at 19:10

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

8

You are using Xenial but your sources.list contains links for Precise. To rectify that,

  • Backup your current sources.list:

    sudo mv /etc/apt/sources.list /etc/apt/sources.list.bak
    
  • Create a new source.list:

    sudo nano /etc/apt/sources.list
    
  • Copy and paste the following into it:

    deb http://us.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse 
    deb-src http://us.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
    deb http://us.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse 
    deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 
    deb http://us.archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse 
    deb http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse 
    deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse 
    deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 
    deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse 
    deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse 
    
  • Then, on the keyboard press the following:

    Ctrl + X then Y and finally Enter.

  • Finally, try updating your sources:

    sudo apt-get update
    

EDIT:- The ppa error is what it says. That ppa doesn't have a release file for Xenial. To remove ppas, please follow this answer at AskUbuntu.

  • Thanx for the insight and solution. Other errors(new) got resolved by this solution but few errors(old) are still there. – Nikhil Sep 6 '16 at 8:06
  • @Nikhil - Edited my answer. Please follow that link to get rid of that error. – Raphael Sep 6 '16 at 9:03

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