This is NOT an installation problem question. I've had both op sys working fine side-by-side for a couple of weeks now. I'm using Ubunutu 12.04 64-bit.
This morning when I tried to switch from Win8 to Ubuntu, it just rebooted into Win8. No grub screen whatsoever. This is the 3rd machine I've had dual-booting & have never seen this, but then Win8 is a 1st for me & has thrown some pretty awesome blocks in the path to get to here. Atrocious op sys...
I'm assuming the ASUS updater did this yesterday. (ASUS R503U)
So, do I just put the Ubuntu disk in & reinstall grub?