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I'm quite new to Ubuntu and has just had this error when trying to use the update command. Would anyone be be able to help me solve this?

Thank you!

~$ sudo apt-get update
[sudo] password for alastair: 
Ign:1 http://ppa.launchpad.net/nvbn-rm/ppa/ubuntu bionic InRelease
Hit:2 http://security.ubuntu.com/ubuntu bionic-security InRelease              
Hit:3 http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu bionic InRelease
Err:4 http://ppa.launchpad.net/nvbn-rm/ppa/ubuntu bionic Release               
  404  Not Found [IP: 91.189.95.83 80]
Hit:5 http://gb.archive.ubuntu.com/ubuntu bionic InRelease                     
Hit:6 http://gb.archive.ubuntu.com/ubuntu bionic-updates InRelease       
Hit:7 http://gb.archive.ubuntu.com/ubuntu bionic-backports InRelease     
Hit:8 http://archive.canonical.com/ubuntu bionic InRelease
Reading package lists... Done                      
E: The repository 'http://ppa.launchpad.net/nvbn-rm/ppa/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.
Alastair
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1 Answers1

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I have deleted the launchpad links from Softwares and Updates as per this link: How to remove a repository? and that seems to have worked for now.

Alastair
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