[ubuntu] Installing Ubuntu 20.04.1 on Macbook pro 2018(T2 chip)

Hi All,

I am trying to install Ubuntu 20.04.1 on Macbook Pro(T2 Chip) on BigSur as dual boot.
I have disabled the secure boot option and also the system integrity protection. But the installation is failing with the error "Executing 'grub-install /dev/nvme* failed. This is a fatal error."

I tried running the boot-disk repair utility and that failed with Locked NVRAM error.

I tried installing on the Internal SSD,external SSD and HDD, all hit the same error.

Can you tell me how to fix this issue and install Ubuntu on my MacBook Pro?

Thanks,
Veera