On 2015-11-16 11:55, janpenguin wrote:
> Hi,


Hello,


> The system setup was
> /dev/sda - bootable USB stick
> /dev/sdb - Hard disk

> Unable to install GRUB in /dev/sda
> Executing 'grub-install /dev/sda' failed.


Since you've been installing
Devuan on the hard disk
you want to run "grub-install /dev/sdb".

I was having grub errors when trying to
install Debian as the second OS;
if it had happened I was skipping the step.

Mitt