Custom Linux screen resolution in VirtualBox

Applies to Ubuntu Based Distributions. This was written in Windows 10 using Virtualbox running Linux Mint Cinnamon Edge.

Open your Terminal and paste the following command, ‘sudo apt-get install virtualbox-guest-dkms’. 

Click ‘Enter’ when prompted to install Guest Additions to the Virtual Machine.

Once complete, in Virtual box first go to ‘Settings > Video > Video Memory = 128 MB, Enable 3D acceleration = true’. 

Then Install ‘Guest Additions’.

Now in your Virtual Machine create in file in ‘/etc/X11/’ called ‘xorg.conf’ using your test editor.

Paste the following with the screen resolution you require:

Section “Device”
Identifier “Configured Video Device”
EndSection
Section “Monitor”
Identifier “Configured Monitor”
EndSection
Section “Screen”
Identifier “Default Screen”
Monitor “Configured Monitor”
Device “Configured Video Device”
SubSection “Display”
Modes “2560×1080”
EndSubSection
EndSection

Save the changes and then restart your virtual machine, it should automatically load your custom resolution.