I am getting a below error when I do

sudo apt-get update

Reading package lists... Done
W: The repository 'http://download.opensuse.org/repositories/home:    /Horst3180/xUbuntu_16.04  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.

Can anyone tell what might be the issue

EDIT: Output of cat /etc/apt/sources.list

deb http://archive.ubuntu.com/ubuntu xenial main
deb http://security.ubuntu.com/ubuntu/ xenial-security main
deb http://archive.ubuntu.com/ubuntu xenial-updates main
  • Please can you post the output of cat /etc/apt/sources.list?
    – Olimjon
    Jan 13, 2018 at 12:26
  • I was installing arc-theme recently, it worked fine though. Can that be a reason ?
    – Peter
    Jan 13, 2018 at 12:33
  • You have invalid sources.list and this is the case. You might have added some invalid PPAs to your list.
    – Olimjon
    Jan 13, 2018 at 12:35
  • cat /etc/apt/sources.list deb archive.ubuntu.com/ubuntu xenial main deb security.ubuntu.com/ubuntu xenial-security main deb archive.ubuntu.com/ubuntu xenial-updates main
    – Peter
    Jan 13, 2018 at 12:37
  • Please, post the output of the command as an edit, as you see comments cannot contain more than one line...
    – Olimjon
    Jan 13, 2018 at 12:51

1 Answer 1


First of all make sure that, this works:

sudo rm -rf /var/lib/apt/lists/*
sudo rm -rf /etc/apt/sources.list.d/*
sudo apt-get update

If it did not work, count that, I did not found any other choice for you besides running

sudo apt-get update --allow-unauthenticated

This is a security risk, but if you are ready for this you can use --allow-unauthenticated flag for some other apt commands.

  • 2
    Deleting the two files before calling update works.
    – JMK
    May 12, 2018 at 18:47
  • worked like charm, will you explain what is happening :D
    – Vinujan.S
    Oct 21, 2018 at 18:55
  • 1
    @Vinujan.S, it just deletes other ppa entries from computer.
    – Olimjon
    Oct 25, 2018 at 0:05

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