Hi!
First of all: sorry for the late reply. I was on vacation and couldn't try it out.
I tried writing in dd mode but it didn't help. I also tried editing in the GRUB menu like you said but there is another problem.
I opened the editor with e and the only thing in there is following:
Code:
setparams 'Try or Install Ubuntu Server'
set gfxpayload=keep
linux /casper/vmlinuz ---
initrd /casper/initrd
And btw. I used the new LTS 24.04 as well.
Hope you can still help me :´(