Nothing to worry about especially if it boots fine and loads your graphical environment. It's just a grub warning message because grub doesnt play well with (presumably) nvidia. You could probably make some tweaks to remove the error but there's really no reason to bother.
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As it boots fine (and changing into wayland later) I think you can just ignore it.
Edit: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/2012181
So, its a bug?
It’s not exactly a bug. It’s just that Linux is extremely verbose and often spits out debug messages for things that are not relevant to your system.
No, it is a bug (I think) because GRUB should display in native resolution and because of a bug can't figure it out and displays in 800x600. It is however only cosmetic.
Its probably just wrong video mode set as message says... But either way who cares about grub resolution
It's all fun and games until you have to repair your system with 1x1 resolution
Morse code tty?
Then just throw your screen and GPU out, for what other reason would we have beepers on mainboards?
Let me guess, you have an Nvidia card?
Yes.
Red Dead Pixel Redemption.
I had this error several times (also cases where it would not boot afterwards). It usually appears after installing Nvidia drivers.
The first two lines seem like they probably came from X, the old standard UI system for *nix. The last line is just saying that your 2nd partition on your 3rd disk was checked with no errors found. This is fine.
Given that the UI then starts up you can ignore these messages. They're there in case the system fails to start up after that point.
GRUB (or any other bootloader) doesn't care about and in fact doesn't even know about X, Wayland, or any other userland GUI system.
According to DDG it's a Grub issue. There are a couple of things you could try by searching that error message.
Did you install Ubuntu alongside Windows, or do a fresh install after wiping?
Its fresh install, no dual boot
What are your PC specs? Make sure CSM and Secure Boot are disabled in the BIOS.