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Environment Setup Details

• Windows 10 Professional


• Oracle VirtualBox version 5.1.2r108956
  


• Ubuntu version 16.04.1 downloaded as ISO image name ubuntu-16.04.1-desktop-i386.iso
  

Configurations Explained (and attempted)

I have tried almost all setting combinations with this Ubuntu VM via the VirtualBox configuration options where it does not give me the below:

• 
  

  "invalid settings detected"

  
  

The rainbow colored screen below keeps loading with those characters as shown in that screen shot when the VM Ubuntu desktop comes up.

I've updated VirtualBox to the latest version and I've also did the same with the Ubuntu ISO download.

The Rainbow Ubuntu Desktop Load (starburst-style)

One VirtualBox VM Configuration

Again I've tried almost all configuration setting combinations just as explained above

What am I missing for this should-be-easy task?

Ubuntu VirtualBox Rainbox Screen Fix

After trying different things with the Q&A method here as per the other answers and trying different variations of options for the VM configuration, etc. I decided to take a crack at googling it again and then I stumbled across this post that I figured I'd try to resolve my issue which is similar.

The keys I pressed to resolve were not exactly the same as mentioned in the post in my case for whatever reason, but this post absolutely gave me the pointer for the instruction.

My Solution

When the rainbow screen shows up, I pressed Right
Ctrl+F7 together and then let off which
popped up the below screen with just the little blinking cursor.

At the blinking cursor screen I pressed Right
Ctrl+F1 and then the option popped up to
Install Ubuntu or Try Ubuntu as usual—in my case I will always Try Unbuntu and never install it so it'd be nice to have a fix to not
have to press these keys per each load of the VM, but that's for a new
question—I appreciate all the answers from everyone +1 for all
efforts.

Final VM Configs

For me, I had to install Ubuntu with the Enable EFI option enabled. I didn't get the rainbow screen at startup. I did have to edit the startup.nsh file after the installation completed, but Ubuntu works great now.

You can see my settings and walkthrough here: http://www.tecklyfe.com/install-ubuntu-16-04-using-virtualbox/

Scroll down to the Troubleshoot Rainbow Startup Screen near the bottom of the article.

Ok try setting in system motherboard tab extended features enable all. Processor tab slide to 2 CPU and in the acceleration tab (still on system settings) choose legacy for paravirtualization interface and enable all hardware virtualization.

For me it was as simple as changing the screen controller (in configuration > screen > (In my case the default was svga and I changed it to VirtualBoxVGA)

I've installed Ubuntu in Virtualbox no problem, so, I would recommend changing these things:

• Change Debian 32 bit to Ubuntu 32 Bit


• Max out the VRam Slider and enable 2D and 3D acceleration (if possible)


• Try a 64 bit ISO, or an older version (16.04 instead of 16.04.1, then upgrade once installed)


• If everything above doesn't work, erase that virtual machine and make a new one, with default settings.


• If all else fails, try uninstalling Virtualbox, rebooting and re-installing.