Grub menu entry fails

I installed Manjaro parallel with Ubuntu.
I did update-grub from Ubuntu.
A manjaro entry was created but it does not work.
It gets a blank screen and KB does nothing.
Must power off and reboot to some other grub menu.

Here is the grub menu entry created by update-grub from Ubuntu:

insmod part-gpt
insmod ext2
search --no-floppy --fs-uuid --set=root
linux /boot/vmlinuz-5.9-x86_64 root=UUID= ro quiet apparmor=1 security=apparmor udev.log-priority=3
initrd /boot/intel-ucode.img

Hello @mkornelix :wink:

Grub of manjaro is not compatible with Grub of Ubuntu, because it is more customized. Use instead separate efi and boot partitions for each Installation.

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