I reinstalled Ubuntu Gamepack after accidentally wiping it from my SSD, and I needed to update GNOME to properly boot into it.
I've looked at several other threads and tried those solutions, but nothing has panned out for me. I have some functions that aren't working for me, such as my mouse disconnecting after a certain amount of time, all audio in/out devices not registering after restarting Discord, among other software issues.
If nothing else pans out, I'm considering reinstalling, although that may create more problems than it solves.
Here is the error I'm getting:
Hit:1 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:3 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://download.virtualbox.org/virtualbox/debian focal InRelease
Get:6 https://repo.skype.com/deb stable InRelease [4,502 B]
Hit:7 http://build.openvpn.net/debian/openvpn/release/2.4 bionic InRelease
Get:8 https://deb.opera.com/opera-stable stable InRelease [2,590 B]
Hit:9 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:10 https://repo.steampowered.com/steam stable InRelease
Ign:11 http://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64 InRelease
Hit:12 https://repo.windscribe.com/ubuntu bionic InRelease
Hit:13 https://download.onlyoffice.com/repo/debian squeeze InRelease
Hit:14 http://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64 Release
Hit:15 http://linux.teamviewer.com/deb stable InRelease
Err:16 https://ppa.laucnchpad.net/jarnos/ppa-purge/ubuntu eoan InRelease
Could not resolve 'ppa.laucnchpad.net'
Hit:17 http://ppa.launchpad.net/yannubuntu/boot-repair/ubuntu focal InRelease
Hit:18 https://dl.winehq.org/wine-builds/ubuntu focal InRelease
Hit:20 http://deb.anydesk.com all InRelease
Hit:22 http://ppa.launchpad.net/alexlarsson/flatpak/ubuntu focal InRelease
Err:6 https://repo.skype.com/deb stable InRelease
The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <se-um@microsoft.com>
Hit:23 https://repo.protonvpn.com/debian stable InRelease
Hit:24 http://deb.playonlinux.com bionic InRelease
Get:25 https://mega.nz/linux/MEGAsync/xUbuntu_20.04 ./ InRelease [2,441 B]
Err:8 https://deb.opera.com/opera-stable stable InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DD3C368A8DE1B7A0
Hit:26 http://ppa.launchpad.net/costales/folder-color/ubuntu focal InRelease
Hit:27 http://ppa.launchpad.net/gencfsm/ppa/ubuntu bionic InRelease
Hit:19 https://archive.ualinux.com/deb all InRelease
Hit:21 https://archive.ualinux.com/deb ubuntupack InRelease
Hit:29 http://ppa.launchpad.net/libreoffice/ppa/ubuntu focal InRelease
Hit:30 http://ppa.launchpad.net/libreoffice/libreoffice-7-0/ubuntu focal InRelease
Hit:31 http://ppa.launchpad.net/libretro/stable/ubuntu focal InRelease
Hit:32 http://ppa.launchpad.net/lutris-team/lutris/ubuntu focal InRelease
Hit:33 http://ppa.launchpad.net/remmina-ppa-team/remmina-next/ubuntu focal InRelease
Hit:34 http://ppa.launchpad.net/eivnaes/network-manager-sstp/ubuntu focal InRelease
Hit:35 http://ppa.launchpad.net/teejee2008/ppa/ubuntu focal InRelease
Hit:36 http://ppa.launchpad.net/unit193/encryption/ubuntu focal InRelease
Reading package lists... Done
W: GPG error: https://repo.skype.com/deb stable InRelease: The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <se-um@microsoft.com>
E: The repository 'https://repo.skype.com/deb stable InRelease' is not signed.
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: GPG error: https://deb.opera.com/opera-stable stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DD3C368A8DE1B7A0
E: The repository 'https://deb.opera.com/opera-stable stable InRelease' is not signed.
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.
