and now i can t open my settings but the third option disappeared and i think i can t boot again if i didnt fix it
Okay. Ignore the driver installation as we can take on it when you booting into kernel 5.4.0
[[HOW TO] set an older kernel to default boot]
i didn t know how to do it though
an error in the third command:dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
but its continuing
I'll guide you.... Just after I get something to eat. Need a break.
the third command finished but there was an error:Errors were encountered while processing:
nvidia-340
i m gonna wait for u to finish your break
Okay, I'm good to go for another round 
In the terminal;
sudo nano /etc/default/grub
nano is a terminal text editor. Now use the arrow keys and find GRUB_DEFAULT=0 and change it to GRUB_DEFAULT=saved
next Add GRUB_SAVEDEFAULT=true
Save = ctrl+o
Exit = ctrl+x
then
sudo update-grub
reboot.
Then hit tab or esc at the M.B. splash screen to get to Advanced Options for Zorin and select kernel 5.4.0 and boot into it.
how to know if i saved it?
because when i click ctrl+o i hear a sound and thats it and when i press ctrl+x it doesn t exit but i hear a sound
You have to git *enter after saved it (ctrl+o).
save files uinder different names?
yes or no
it is then?
i press y?
when closed, reopen the file again and give me a screenshot, to make sure it's set as it should.
its not saved
do i do it again?
Try make the changes and instead of ctrl+o, then press ctrl+x and say yes afterwards.
