Grub should boot at the new, higher resolution, and then that resolution should continue through after you are logged in. Host: Ubuntu 14.04 64 bits Guest: Windows 10 64bits Virtualbox 5.0.10-104061Ubuntutrusty (installed from your PPA) When I open the virtual machine ( with Full screen mode activated) the Windows desktop has the size of full-screen mode ( the top bar of apps is hidden) but the VirtualBox window isn't in full-screen. Update grub and reboot: update-grub2 & shutdown -r now Select the resolution that works for you (in my case, 1152x864x32).Įdit /etc/default/grub to modify/create a line GRUB_GFXMODE=1152x864x32 (where you replace the resolution with the one appropriate for your environment).Įdit /etc/grub.d/00_header to modify the line if then GRUB_GFXMODE=1152x864x32 fi Enter the commend vbeinfo to see a list of resolutions. This will drop you into the grub console. Reboot the system and keep the Shift key till the grub windows appears then hit c. This process can be tricky for people without experience or the right knowledge. This can be done by installing VirtualBox Guest Additions. (Max is 256 megs - but assuming 3840 x 2160 at 32 bit color, youll need roughly 32+ megs ). Problem If you want to use VirtualBox and Ubuntu Linux as guest OS you will want to use full screen, shared folder, clipboard sharing, etc. Ensure you have enough vram allocated for the virtual GPU to run the Guest in the Color Depth / resolution you want. Enable 3d acceleration for the virtual GPU. Press the Host Key and F simultaneously to enter full-screen mode. Identify the resolution that your VirtualBox environment supports. Configure a VMSVGA virtual GPU configured for your Linux Guest. Locate the key displayed in the lower right corner of the VirtualBox window. The answer I found was a combination of How do I increase console-mode resolution? and How to use ubuntu server full screen in virtualbox? The former provided information for changing grub's display resolution, and the latter assisted me in diagnosing why the former wasn't resulting in any resolution change.
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