Hi, > I'm trying to install Debian Stretch with full disk encryption > (LVM-on-LUKS). But when the installer is trying to install Grub in crashes > with the following error message: > > ``` > Unable to install GRUB in dummy > Executing 'grub-install dummy' failed. > > This is a fatal error. > ``` > > […] > > I'm able to install NixOS with GRUB without needing an separate /boot > partition. So I believe it isn't a limitation in GRUB. Can't find any > information in the documentation that says that a separate /boot partition > is mandatory. This message does not have to do anything with a /boot partition - where your OS is isntalled does not matter for grub-install, grub-install only intalls the bootloader part, either to MBR or to the EFI ESP partition. What could happen if GRUB does not find your kernel image in /boot is that it does not generate a GRUB record for it during update-grub, but it will not cause the installation to fail. That said, have you made sure to mount the EFI ESP partition as /boot/efi? There are quite a few mentions of this error spread over all kinds of distributions (just try asking your search engine of choice for debian "grubd-install dummy"). E.g.: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=865417 Cheers, Nik
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