can't install grub2 inside cubic using Debian (11) as ISO image

[Marietto]

Hello to everyone.

I'm trying to customize the Debian 11 iso image with cubic. The most important parameter that I should set up within cubic is the following :

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_iommu=on"

what's the problem ? the problem is that I can't install grub2 inside cubic. If I do that,I get the error "grub can't be installed" because the Debian installation tool tries by itself to install grub2,but since it finds that it has been already installed /by me/,it won't install it again and the installation of Debian fails on that point. To fix this problem I don't install grub2 inside cubic anymore,but only grub legacy. Grub legacy makes the produced ISO bootable. BUT I've realized that after installing it,the file /etc/default/grub that I always use to add the parameter GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_iommu=on" is not created. I tried to create it by myself inside Cubic,before the Debian installer installed grub2,but the ISO image didn't boot. I've double checked : I've renamed /etc/default/grub into /etc/default/grub_ and I've burned a new ISO image and boom : it has been able to boot.

So,my question is : grub legacy which configuration file does it use ? I ask this because I need to add the parameter that I've explained above "quiet splash intel_iommu=on" inside of it. Or,do you know another method to add it ? thanks.

[Cubic PPA (cubic-wizard)]

@Marietto,

Please see this important message:

    https://bugs.launchpad.net/cubic/+bug/1954947

Also, if you click on the "Cubic Website" item in the hamburger menu in the headerbar in Cubic, you will be taken to the official web site, where you may ask your question on the Issues tab there.

[Cubic PPA (cubic-wizard)]

This capability has been added in Cubic version 2022.11.73.

See Issue #114, [Add support for Debian](https://github.com/PJ-Singh-001/Cubic/issues/114) for more details.

Please test and report any issues.