all right, it all worked after all! Pascal, thank you very much for your help and patience.
I think this needs to be somewhere on a wiki page - I saw many searches for this problem, and the suggested solution is to give up grub and install some other boot manager from sourceforge, which i did not feel comfortable to do. I could write something up from the user perspective which you can edit and publish, let me know if you think this is something worth pursuing. thank you again, -dc On Thu, Dec 20, 2018 at 11:24 AM Pascal Hambourg <[email protected]> wrote: > Le 20/12/2018 à 17:21, David Collier a écrit : > > > > I added the entry to mount Windows EFI partition, so /boot/efi has the > EFI > > directory entry in it now. > (...) > > update-grub finds the windows partition now and adds it to the menu. but > > running grub-install still fails: > > > >> grub-install > > Installing for x86_64-efi platform. > > grub-install: warning: disk does not exist, so falling back to partition > > device /dev/sdb3. > > grub-install: warning: disk does not exist, so falling back to partition > > device /dev/sdb3. > > grub-install: warning: disk does not exist, so falling back to partition > > device /dev/sdb3. > > grub-install: error: disk `hostdisk//dev/sdb3' not found. > > /dev/sdb3 is the EFI partition on the Windows disk, isn't it ? > > Does /boot/grub/device.map exist, and what does it contain ? > Does it help if you run grub-mkdevicemap before grub-install, or run > grub-install with --recheck ? > > > when booting from the USB stick in EFI mode the new menu item boots > windows > > successfully, but if I boot from the SSD the same menu shows, but windows > > does not boot. > > The SSD boots GRUB in BIOS mode but the Windows menu entry in grub.cfg > is intended only for EFI mode, as in your original post. > > _______________________________________________ > Help-grub mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/help-grub > _______________________________________________ Help-grub mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-grub
