[Bug 1476178] [NEW] Installer tries to install grub on the wrong disk

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I have just installed Ubuntu 14.04 on a Dell precision M3800, via
download of the USB network installer.

This gave me some headache installing grub, since during the install, the hard disk was assigned to /dev/sdb.
Installing the file system worked well, but the grub part failed. No matter what I did, it always tried to install grub on /dev/sda

I ended up in continuing the install without bootloader, and when finished, I escaped the install sequence and executed a shell where I executed this command:
grub-install --root-directory=/target /dev/sda

Thus I worked around the problem, but I think that this is an easily
fixable bug in the installer. It should just check which device is
mounted on /target

PS: I guess the cause of this behaviour, is that the USB stick which I
use, does not contain a driver for the disk controller. Thus the driver
module is first loaded when the USB gets network access and can fetch
the driver from the net. Thus the USB is always assigned /dev/sda. When
the system is installed the kernel knows the driver and the disk gets
/dev/sda

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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Installer tries to install grub on the wrong disk
https://bugs.launchpad.net/bugs/1476178
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