Newly installed Ubuntu 17.10.
Monitor: 2560x1080 60hz resolution with HDMI cable.
At boot loading I had some weird glitches as described in this question .
I disabled wayland in boot loading screen using: WaylandEnable=false
The boot loading screen & the login screen have the wrong resolution.
After I log in the resolution changes to the correct one.
How can I change the resolution during the boot loading screen and the login screen?
I already tried to edit
/etc/default/grub and add my resolution for
GRUB_GFXMODE. But it has no effect. Also related to this, when I type
vbeinfo in the grub command line it says command not found.