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I know this question has been brought up ad nauseam, but I want to be sure I make the right changes to fix it. I'm pretty sure I need to change some of the settings in Software & Updates, but which ones? Or is there something else I need to resolve? Here's the terminal message that displays when I run sudo apt-get update along with the Software & Updates menu.

enter image description here

edit: included text.

nicholas@klaus:~$ sudo apt-get update
[sudo] password for nicholas: 
Hit:1 http://repo.steampowered.com/steam precise InRelease
Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease                   
Hit:3 http://us.archive.ubuntu.com/ubuntu bionic InRelease                     
Hit:4 http://security.ubuntu.com/ubuntu bionic-security InRelease              
Hit:5 http://packages.microsoft.com/repos/vscode stable InRelease              
Hit:6 http://dl.google.com/linux/chrome/deb stable Release                     
Get:7 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]   
Hit:8 https://dl.winehq.org/wine-builds/ubuntu bionic InRelease                
Ign:9 http://ppa.launchpad.net/mjblenner/ppa-hal/ubuntu bionic InRelease       
Hit:10 http://repository.spotify.com stable InRelease                          
Err:12 http://ppa.launchpad.net/mjblenner/ppa-hal/ubuntu bionic Release        
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists... Done                      
E: The repository 'http://ppa.launchpad.net/mjblenner/ppa-hal/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.
Display name
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  • If your message was text, I could copy & paste the URL to check it supports 'bionic' (or 18.04, for example pasting it into a browser & looking to see there is a folder titled 'bionic' in dists/). I can't copy/paste from a picture so you'll have to do the checks, and remove if it doesn't support your bionic release. I'd suggest checking your release is supported before (not after) you add PPAs. – guiverc Feb 12 '19 at 21:41
  • Sorry about that. I added the text. – Display name Feb 12 '19 at 21:43
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    Copy & paste the url into a browser - when you open the dists/ folder (ie. navigate to http://ppa.launchpad.net/mjblenner/ppa-hal/ubuntu/dists/) you'll note support for saucy-xenial - ie. support in the PPA ended at 16.04 (no folders for any later release exist there). It needs removal. fyi: before you add the PPA you can check the PPA's main page & view supported... but from the URL in error messages I find this method faster – guiverc Feb 12 '19 at 21:44
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    https://askubuntu.com/questions/307/how-can-ppas-be-removed – guiverc Feb 12 '19 at 21:50
  • So just to clarify for future reference, if my current release isn't listed under ppa.launchpad.net/*/*/ubuntu/dist that means it is no longer supported and should be removed? Does this issue/fix only apply to PPA or does it apply to missing/unsupported repository files in general? – Display name Feb 12 '19 at 22:06

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