I have a driver error on my Ubuntu 23.04: the background of the 3D and 2D views is transparent and the Ubuntu desktop is visible. I have tried all the drivers that Ubuntu offers, but the problem persists or the driver does not allow me adequate screen sizes. Has anyone been able to solve it?
As you said… sadly… a driver error…
X11 or wayland ??
(Being on Debian with X11)
I took into account your observation “X11 or wayland?” and I activated wayland with the tutorial:
Backgrounds in 3D and 2D views now look as they should!
Thank you
Maybe there is even a commandline switch for blender to activate X11 ? I recently discovered this for the godot/engine-editor…V4. (some red background for the gui text if not activated…)…
I didn’t looked this up yet… because mey blender is behaveing fine 
…
… hmmm… via environment variable… from:
Disable Wayland (forcing X11)
WAYLAND_DISPLAY="" blender