xubuntu 19.10 fails to install with /boot on different drive - grub-install error

[Ralf Mardorf]

FWIW the attachment does show my current syslinux menu config.
An automatically generated grub menu config is a PITA, but actually
it's possible to edit a grub.cfg manually, that is as clear as my
syslinux.cfg. I've done this for years with grub.cfg, before I migrated
to syslinux.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: syslinux.cfg
Type: application/octet-stream
Size: 5528 bytes
Desc: not available
URL: <https://lists.ubuntu.com/archives/ubuntu-users/attachments/20191122/757e47fa/attachment.obj>