Okay, I just noticed that I was using an older version (3.7) of diskimage-builder.
Using 3.11, the grub2 installation on centos8 works fine, so this bug can be closed, I guess.
Okay, I just noticed that I was using an older version (3.7) of diskimage-builder.
Using 3.11, the grub2 installation on centos8 works fine, so this bug can be closed, I guess.