I get this reply:
What does that mean, not mounted?
ubuntu@ubuntu:~$ sudo grub-install /dev/sda
/usr/sbin/grub-probe: error: cannot find a device for /boot/grub (is /dev mounted?).
I just want to put grub into mbr so I can boot.
in diskutility it says:
Model: ATA Corsair GT
Partitioning: Master Boot Record
Serial Number: (lots of numbers)
Smart Status: Disk is healthy
So, yes, the drive is located at /dev/sda.
The first partition on drive is linux (ext4).