On Fri, 8 Jul 2016 08:25:34 -0400, Tom H wrote: >On Fri, Jul 8, 2016 at 3:55 AM, Ralf Mardorf wrote: >> >> since there seems to be no way to prevent Ubuntu from enforcing to >> install GRUB > >Why can't you pin grub (and other bootloaders) to "-1"? Does this prevent do-release-upgrade from installing GRUB?