Is there a way to change Mount-Point after installation of elementaryOS?

Question

I have recently installed elementary OS on a USB drive from a system running Windows 10, but I booted live from elementary OS DVD for installation purposes.

Now every time I boot my PC without the USB drive, an error is displayed:

error: no such device:

error: unknown file system

Entering rescue mode.....

grub rescue>_

From what I learned it seemed that I need to reinstall the OS and change the mount point to where the windows partition is located, but I have already done many changes to the OS so I don't want to lose any of it... So is there any way to change the mount point without reinstalling or any other way to cure this disease?

Answer 1

Seems that grub is installed on your boot disk and is looking for grub information on the USB drive which it cannot read because the USB drive is unconnected.

I suspect that you have installed grub onto the master boot sector of your boot disk instead of installing grub onto the master boot sector of the USB drive. Probably, you have over written the Win10 bootloader from the master boot sector of your boot disk.

So I am guessing that when you installed the Linux grub bootloader during the OS install, you installed it to the wrong disk.

Try searching for restoring master boot sector bootloaders.