How to replace Ubuntu grub bootloader with Endeavour's

[zoli62]

Ubuntu grub does not handle Arch-based distributions well. Check out this post.

UEFI Grub and BIOS Grub in parallel

In the meantime, the problem is solved, meters from the installed Kubuntu grub menu, EndeavourOS can also be started, although only in fallback mode. Thank you all for your constructive comments.