Missing Release File?
I freely admit to still being a bit of a Linux newbie, so it's entirely possible that, if the solution had been a snake, it would have bitten me by now.
On Ubuntu 18.10 AMD64, "apt update" throws an error on the PCSX2 official repository, stating that it lacks a release file and can't be securely updated from.

The output from the command follows:

gconly@gconly-HP-Pavilion-Notebook:~$ sudo apt update
[sudo] password for gconly:
Hit:1 http://repo.steampowered.com/steam precise InRelease
Hit:2 http://linux.teamviewer.com/deb stable InRelease                                 
Hit:3 http://us.archive.ubuntu.com/ubuntu cosmic InRelease                             
Ign:4 http://ppa.launchpad.net/gregory-hainaut...ppa/ubuntu cosmic InRelease
Get:5 http://us.archive.ubuntu.com/ubuntu cosmic-updates InRelease [88.7 kB]
Get:6 http://security.ubuntu.com/ubuntu cosmic-security InRelease [88.7 kB]            
Err:7 http://ppa.launchpad.net/gregory-hainaut...ppa/ubuntu cosmic Release
  404  Not Found [IP: 80]
Get:8 http://us.archive.ubuntu.com/ubuntu cosmic-backports InRelease [74.6 kB]         
Reading package lists... Done                                                          
E: The repository 'http://ppa.launchpad.net/gregory-hainaut/pcsx2.official.ppa/ubuntu cosmic 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.

I hope this is something that can be easily fixed. Thanks in advance!

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Seems like there's a connection issue to your PCSX2-PPA. try to remove it and use the PPA from here:

Tired of always changing your PCSX2 Configuration for different games?

Check this out: https://forums.pcsx2.net/Thread-PCSX2-MultiConfigTool

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