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jan@jan-System-Product-Name:~$ sudo apt-get autoremove
[sudo] password for jan: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  0ad-data 0ad-data-common fonts-texgyre libboost-filesystem1.58.0
  libboost-system1.58.0 libenet7 libgloox13v5 libgloox14
  libjavascriptcoregtk-1.0-dev libnvtt2 libsdl2-2.0-0 libwebkitgtk-1.0-0
  libwebkitgtk-dev libwildmidi1 libwxbase3.0-0v5 libwxgtk3.0-0v5
0 upgraded, 0 newly installed, 16 to remove and 0 not upgraded.
After this operation, 1,611 MB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 265537 files and directories currently installed.)
Removing 0ad-data (0.0.20-1) ...
Removing 0ad-data-common (0.0.20-1) ...
Removing fonts-texgyre (20160520-1) ...
Removing libboost-filesystem1.58.0:i386 (1.58.0+dfsg-5ubuntu3.1) ...
Removing libboost-system1.58.0:i386 (1.58.0+dfsg-5ubuntu3.1) ...
Removing libenet7:i386 (1.3.12+ds-2) ...
Removing libgloox13v5:i386 (1.0.13-3build1) ...
Removing libgloox14:i386 (1.0.15-2) ...
Removing libwebkitgtk-dev:i386 (2.4.11-3) ...
Removing libjavascriptcoregtk-1.0-dev:i386 (2.4.11-3) ...
Removing libnvtt2:i386 (2.0.8-1+dfsg-8.1) ...
Removing libsdl2-2.0-0:i386 (2.0.4+dfsg2-1ubuntu1) ...
Removing libwebkitgtk-1.0-0:i386 (2.4.11-3) ...
Removing libwildmidi1:i386 (0.3.8-2) ...
Removing libwxgtk3.0-0v5:i386 (3.0.2+dfsg-2) ...
Removing libwxbase3.0-0v5:i386 (3.0.2+dfsg-2) ...
Processing triggers for libc-bin (2.24-3ubuntu1) ...
Processing triggers for fontconfig (2.11.94-0ubuntu2) ...
jan@jan-System-Product-Name:~$ sudo apt update
Hit:1 http://ubuntu.mirror.neology.co.za/ubuntu yakkety InRelease
Hit:2 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial InRelease    
Ign:3 http://dl.google.com/linux/earth/deb stable InRelease                    
Hit:4 http://dl.google.com/linux/earth/deb stable Release
Ign:6 https://download.01.org/gfx/ubuntu/16.04/main xenial InRelease
Err:7 https://download.01.org/gfx/ubuntu/16.04/main xenial Release
  504  Gateway Time-out
Reading package lists... Done
E: The repository 'https://download.01.org/gfx/ubuntu/16.04/main xenial Release' does no longer 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.