sudo apt update
Get:1 http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_16.04 InRelease [1548 B]
Hit:2 http://ppa.launchpad.net/alexlarsson/flatpak/ubuntu disco InRelease
Hit:3 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:4 http://archive.canonical.com/ubuntu groovy InRelease
Hit:5 http://de.archive.ubuntu.com/ubuntu groovy InRelease
Hit:6 http://repository.spotify.com stable InRelease
Ign:7 http://ppa.launchpad.net/gwendal-lebihan-dev/hexchat-stable/ubuntu groovy InRelease
Hit:8 http://packages.microsoft.com/repos/code stable InRelease
Hit:9 http://de.archive.ubuntu.com/ubuntu groovy-updates InRelease
Hit:10 https://deb.opera.com/opera-stable stable InRelease
Hit:11 http://de.archive.ubuntu.com/ubuntu groovy-security InRelease
Hit:12 https://ftp.gajim.org/debian unstable InRelease
Hit:13 https://brave-browser-apt-release.s3.brave.com stable InRelease
Hit:14 http://ppa.launchpad.net/quiterss/quiterss/ubuntu focal InRelease
Hit:15 http://de.archive.ubuntu.com/ubuntu groovy-backports InRelease
Hit:16 https://repo.skype.com/deb stable InRelease
Hit:17 http://ppa.launchpad.net/vincent-vandevyvre/vvv/ubuntu eoan InRelease
Err:18 http://ppa.launchpad.net/gwendal-lebihan-dev/hexchat-stable/ubuntu groovy Release
404 Not Found [IP: 91.189.95.85 80]
Err:1 http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_16.04 InRelease
The following signatures were invalid: EXPKEYSIG 0FAD31CA8719FCE4 home:stevenpusser OBS Project <home:stevenpusser@build.opensuse.org>
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/gwendal-lebihan-dev/hexchat-stable/ubuntu groovy 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.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_16.04 InRelease: The following signatures were invalid: EXPKEYSIG 0FAD31CA8719FCE4 home:stevenpusser OBS Project <home:stevenpusser@build.opensuse.org>