gunqqer@Friithian:~$ sudo apt update; sudo apt full-upgrade
Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://ppa.launchpad.net/elementary-os/stable/ubuntu xenial InRelease
Get:3 http://download.virtualbox.org/virtualbox/debian xenial InRelease [7,883 B]
Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit:5 http://repo.steampowered.com/steam precise InRelease
Ign:6 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 ./ InRelease
Hit:7 http://ppa.launchpad.net/hluk/copyq/ubuntu xenial InRelease
Err:3 http://download.virtualbox.org/virtualbox/debian xenial InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A2F683C52980AECF
Hit:8 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 ./ Release
Hit:10 http://ppa.launchpad.net/linrunner/tlp/ubuntu xenial InRelease
Hit:11 http://ppa.launchpad.net/nathan-renniewaldock/flux/ubuntu xenial InRelease
Hit:13 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial InRelease
Hit:14 http://ppa.launchpad.net/noobslab/themes/ubuntu xenial InRelease
Hit:15 http://ppa.launchpad.net/obsproject/obs-studio/ubuntu xenial InRelease
Hit:9 https://repo.dumalogiya.ru/aptly/public artful InRelease
Hit:16 http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu xenial InRelease
Hit:17 http://ppa.launchpad.net/philip.scott/elementary-tweaks/ubuntu xenial InRelease
Hit:18 http://ppa.launchpad.net/ravefinity-project/ppa/ubuntu xenial InRelease
Ign:19 http://ppa.launchpad.net/ubuntu-x-swat/intel-graphics-updates/ubuntu xenial InRelease
Hit:20 http://ppa.launchpad.net/ubuntu-x-swat/updates/ubuntu xenial InRelease
Ign:21 http://ppa.launchpad.net/upubuntu-com/ppa/ubuntu xenial InRelease
Err:22 http://ppa.launchpad.net/ubuntu-x-swat/intel-graphics-updates/ubuntu xenial Release
  404  Not Found
Err:23 http://ppa.launchpad.net/upubuntu-com/ppa/ubuntu xenial Release
  404  Not Found
Reading package lists... Done
W: GPG error: http://download.virtualbox.org/virtualbox/debian xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A2F683C52980AECF
E: The repository 'http://download.virtualbox.org/virtualbox/debian xenial 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.
E: The repository 'http://ppa.launchpad.net/ubuntu-x-swat/intel-graphics-updates/ubuntu xenial 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.
E: The repository 'http://ppa.launchpad.net/upubuntu-com/ppa/ubuntu xenial 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.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  linux-headers-4.13.0-32 linux-headers-4.13.0-32-generic linux-image-4.13.0-32-generic linux-image-extra-4.13.0-32-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.