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I am running Ubuntu 18.04. I can't update in the terminal. Every time I try (by typing sudo apt-get update), I get the message:

E: The repository 'http://ppa.launchpad.net/noobslab/themes/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
wjandrea
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Peter Carter
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    Possible duplicate of [Xenial repository does not have a Release file](https://askubuntu.com/questions/866901/xenial-repository-does-not-have-a-release-file) – N0rbert Aug 06 '18 at 18:35
  • Possible duplicate of [How can I fix a 404 Error when using a PPA or updating my package lists?](https://askubuntu.com/questions/65911/how-can-i-fix-a-404-error-when-using-a-ppa-or-updating-my-package-lists), which if you provided your full `apt-get update` output would show there were 404 errors and is ultimately the actual underlying problem. (PPA doesn't offer packages for that version of Ubuntu, that is) – Thomas Ward Aug 06 '18 at 18:59

1 Answers1

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The ppa you're trying to use does not support 18.04. If you used this command:

sudo add-apt-repository ppa:noobslab/themes

to add it, use:

sudo add-apt-repository --remove ppa:noobslab/themes

to remove it.

Stormlord
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  • I ran the above command and here is what it gave me: Reading package lists... Done E: The repository 'http://ppa.launchpad.net/noobslab/themes/ubuntu bionic Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. – Peter Carter Aug 06 '18 at 18:58
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    You can remove it manually by navigating as root to the `/etc/apt/sources.list.d` directory and deleting the **noobslab themes** related one or two files. If there's one file only, it should have the *noobslab-something.list* extension. If there are two files, the other one should have the *noobslab-something.list.save* extension. After you delete both of them, run `sudo apt-get update` again. – Stormlord Aug 06 '18 at 19:09