What each means:
You are booting in legacy mode.
Have you tried holding left shift key starting at boot to reach the grub menu?
The tab and esc buttons are for EFI boot. This may help.
The rest is not relevant.
OS-Prober being changed to default disabled is annoying but the latest "security decision" from Ubuntu.
@smsdalle, I think we are both inferring that your boot attempt did not reach 5.15... But all you said was:
Please Remember that We Cannot See your Screen.
I used this older guide to reboot from my system with 6.14 kernel into a 6.8 kernel of advanced options without entering grub menu and it worked (add 'sudo' at the beginning of the commands, e.g. sudo grep ...).
Yes. Sorry what I meant with : Yes I did the "1>4"
is yes I did the edit and saved and updated grub.
SO just a question to what I should do after that.
Regarding booting into grub I still have the same problem as post 41/60 - I cannot use any key - key combination, it will simply make the macbook stay turned on with a black screen and a fan that just keeps blowing very loud - so maby making the cpu go to 100% I guess...
The only key I can use at startup/power on is ALT that goes into Boot, where I can choose EFI/The Harddrive
I will try this
it did not work. still keeps booting into 6.8
will it just be easier to reinstall zorin lite by adding the 5.15 kernel to the install iso somehow?
No, sadly adding a kernel to the .iso is quite complicated.
What would be easy though, is removing all kernel's except for the 5.15.
sudo apt remove linux-image-6.8.0-90-generic linux-image-6.8.0-60-generic
sudo nano /etc/default/grub
GRUB_DEFAULT=0
ctl+o, enter, ctl+x
sudo update-grub
reboot.
I am trying to have the mac run the first code - remove linux
but it's been stuck at 5%for the last two hours
Ich habe das gleiche Problem mit meinem Laptop von 2011 es ist ein HP Compaq presario cq57 mit AMD Vision E2 8gb RAM und eine 1tb SSD und ich benutze den um gaming zu machen das Problem er kann kein Windows 10 also bin ich auf zorin os umgestiegen habe aber das gleiche Problem wie sie
That is not normal.
By my clock, you posted this 6 hours ago. Has it progressed or been canceled in this time?
I am sorry for the delay.. the mac completly stuck there at 5% untill it just locked - and I could'nt reboot.. havent had the time these last 2 days, so only just got started on reinstalling today - I'll try to add the 5.15kernel again from post 33, and remove 6.8 and other from post 87
YES after two days of trying to reinstall zorin with many many errors/failed installs for some reason, I changed usb sticks, burned dvd's ect. but finally today it installed and then I did post 33 and post 48, so now my mac is running kernel 5.15 when I run uname -r check this beautiful screenshot 
So now I'm ready to do the next step to get the 340 driver onto my mac.. though just a few questions first - -should I do a snapshot of the OS? or time-mirror or whatever linux calls a backup, and will I be able to reach it without being able to get to a recovery/grub menu?
and regarding grub, not sure if it has any relevence, but when I press Alt to go into ueif/boot order I only have one HDD there called windows I think, If I plug in a dvd or usb stick, ofcourse I will have those as well.
anyways - I think I am finally ready after 8-10days of trying to get kernel 5.15 on startup
I always encourage backing up data, regardless of current circumstances. How you do it is a personal choice. I do not use TimeShift or other software for it as I prefer my more reliable method.
Yes, by booting a LiveUSB and then selecting your restore point that way.
What do you use for back-up? I usually use Hirens boot PE and make mackups on external hdd via Lazesoft - but here on the mac, my hirens just goes into error every time I open up a imaging software - so thats not possible
I do not use a backup tool.
To me, tools add unnecessary complexity. They can fail. They have settings... and they cannot think.
My process is that I keep superfluous data storage. Since on Zorin OS, you can drag and drop a file into a compressed file... I compress all data I want to save in the storage with the folder name that file goes into on my OS.
When I work on any project or add photos to a collected, I also drag them to the "new" to the compressed file in that folder to add it, which means I am Constantly staying backed up with very little time between and always aware of what is backed up.
If I need to reinstall, (Rare!) I use:
Okay - I'm ready 
now the 5.15 kernel is on, so now I was supposed to donload the 340 driver via terminal?
Open the Terminal and type:
sudo add-apt-repository ppa:kelebek333/nvidia-legacy
This will add a Repository to download the Nvidia 340 Driver. When added, type:
sudo apt update && sudo apt install nvidia-graphics-drivers-340
after this the Terminal told me to also run
sudo apt install xorg-modulepath-fix
so I did that
and then I did
sudo apt update && sudo apt install nvidia-graphics-drivers-340
But after running it says - could not located nvidia package 340 drivers
I know my terminal is in danish
but still here is a screenshot
something about it looking at E: drive for nvidia drivers
Do you see the kelebek333 ppa in the list when you run `sudo apt update'?
You can post the screenshot here.
E: means error.
