These are the things I have tried and discovered as I work through implemeting multiple displays.
I have a 6-monitor stand and my goal is to eventually operate all 6 monitors in extended desktop mode. This page begins with a new install of 16.04.4 LTS Server and 4 monitors.
Other than the standard base install from the ISO, I have manually installed the following:
sudo apt-get install openssh-server xfce4 xubuntu thunderbird pidgin shotwell
I list these so if anyone can identify a software or dependecy conflict with something I have installed it may help someone.
Ubuntu Server 16.04.4 LTS
Why not start with a Desktop Distro? I don't want all the extras that come by default and I prefer to install everything manually as I need it.
|System||HP ProDesk 600 G2 SFF|
|Processor||Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz|
|Graphics 1||Sky Lake Integrated Graphics|
|Display Port 1 → HDMI - HP24uh|
|Display Port 2 → Unused|
|VGA → HP LE1901w|
|Graphics 2||PCI Radeon HD 5000/6000/7350/8350 Series|
|HDMI → HP24uh|
|DVI → HP LE1901w|
sudo apt-get install arandr
Looking up error online, I found: https://askubuntu.com/questions/893922/ubuntu-16-04-gives-x-error-of-failed-request-badvalue-integer-parameter-out-o
No nvidia files were found to uninstall
sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core sudo dpkg-reconfigure xserver-xorg