I have a laptop with Ubuntu 12.04 LTS installed as the main OS. The other day I installed Ubuntu-Studio (version 12.04) into another partition on the machine.

The installation went great and when the machine booted, the grub menu popped up and I could see the option for Ubuntu Studio and the vanilla Ubuntu OS'. The problem was that this version of grub, installed by the Studio installer, didn't look great and insisted on putting Studio at the top of the list, and therefore as the main OS to boot.

I use the standard Ubuntu more often, so I booted into that and ran sudo grub-install dev/sda. That worked OK and now Ubuntu boots as normal. Only problem is that the Grub menu doesn't show up and doesn't give me a chance to choose the other OS. Running sudo os-prober shows that it can find ubuntu studio, it doesn't give me a chance to boot it.

Any ideas as to how I can fix this problem?

Cheers in advance.

EDIT:
followed instructions here and saw the boot menu, but the only boot options present were for the standard installation of Ubuntu.