In previous version of "elementary OS" there was the possibility to launch the installation of the OS from the terminal with the command "ubiquity -b". The "-b" option avoided the installation of the GRUB boot-loader. As far as I understood elementary OS 6 does not use "ubiquity" installer anymore but uses the "io.elementary.installer" installer. Does anyone know if there is an option to launch this installer avoiding the installation of the GRUB boot-loader? Or is there any other way to avoid this installation? I am asking because I am trying to install elemetary OS on my old macbook, where I have installed "rEFInd".