Kubuntu 20.04 Asus zenbook "snow screen" at startup

[jareksk]

System worked fine, i guess the last updates created a problem. At startup, just after kubuntu letters shows up, the screen starts snowing. Only if i press f11 or esc during startup systems works. Any solutions to undo last updates or reinstall without losing my settings and data ?
The same thing happens when screen goes to energy saving.

[claydoh]

Try selecting a previous kernel in the grub menu.

What exactly happens when you press f11 or esc? Or, rather, what made you try using these keys?

[jareksk]

I was trying to enter recovery mode, after pressing code lines are loading but so quickly I can't read anything and system goes to login page.
I tried selecting kernel,
5.13.0-27 generic doesn't work,
5.11.0.46 generic is ok
how can I set it up as default ?

[claydoh]

The easiest way is to install and use Grub Customizer.

[jareksk]

In Grub customizer i've entered : General settings - default entry - predefined : Advance options for Ubuntu with Linux....generic

System works but during boot I can see "error: can't find command 'hwmatch'" How can I fix it ?

And still system crashes when it turns to slleep mode or energy saving, screeen goes black and I have to restart using power button.