Ubuntu – Resolution stuck 1024×768 VirtualBox 6 VboxSVGA driver on guest Lubuntu 18.04

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Just upgraded to VirtualBox 6 running on a Windows 10 host and swapped to the SVGA driver (which according to the docs is the new default). Guest is Lubuntu 18.04.

I cannot for the life of me make the resolution increase. I've purged and re-installed Guest Additions to no effect. (using VBoxLinuxAdditions.run uninstall, and re-running).

I've also tried the steps listed here: https://www.tecmint.com/install-virtualbox-guest-additions-in-ubuntu/

Rebooted several times between steps, but the resolution still restricted when using Monitor settings. xrandr lists just 3 resolutions, 640×480, 800×600 and 1024×768.

Any ideas?

Posted in VBox Forums too: https://forums.virtualbox.org/viewtopic.php?f=3&t=91052

Best Answer

In VirtualBox, you have a menu that forces a user-specified screen resolution for the virtual screen. It should help you to specify Lubuntu the correct resolution:

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Ubuntu – Higher screen resolution in VirtualBox

You need to install the VBox guest utilities to add support for the virtualised graphics hardware.

sudo apt-get install virtualbox-guest-utils virtualbox-guest-x11 virtualbox-guest-dkms

Previously you might have needed the "ose" versions:

sudo apt-get install virtualbox-ose-guest-utils virtualbox-ose-guest-x11 virtualbox-ose-guest-dkms

Ubuntu – Screen resolution stuck at 1024×768

I solved the problem by running:

xrandr --addmode VGA1 1366x768

I also added new modes to the change resolution drop down by using,

xrandr --newmode "mode line"

Where mode line replaces the supported resolutions. You can find the supported resolutions by running:

xrandr

Currently, it's working all right.

Best Answer

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Ubuntu – Higher screen resolution in VirtualBox

Ubuntu – Screen resolution stuck at 1024×768

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