I installed Ubuntu 14.04 LTS amd64 desktop on VirtualBox 4.3.26 which is running on OSX10.10 (amd64) and the only option for screen resolution is 640x480. This resolution is found under the System Settings -> Displays -> Resolution drop down menu.

I've tried installing the dkms package and virtualbox-guest-additions (which wasn't able to be found, maybe my sources.list file is bad?) as suggested in other forums, but it didn't help.

This is all freshly installed, I haven't tampered with the machine or settings at all.

What is going on here?


There were two things that were needed: (1) Virtualbox Preferences and (2) Guest Additions for the specific VM.

1) In the top toolbar in OSX, go to VirtualBox -> Preferences -> Display and change your max resolution size. My resolution was set to Automatic and the settings were too low. I changed this to Hint and it allowed me to specify my own Height and Width

2) Start up the VM and log in if necessary. While it's running, click Devices -> Insert Guest Additions CD Image... from the Mac toolbar. There should be some prompts on the VM's terminal then restart the VM when it's completed.

  • Does the Guest Additions CD image always need to be attached to the VM or is it a one time install? – webworm Mar 6 '17 at 18:13

Have you tried installing guest additions from the menu in VirtualBox? That will mount a CD image and run it's installer

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