Some things need to be cleared up.
1) UEFI does not use MBR (Master Boot Record), UEFI uses GPT (GUID Partition Table).
2) GPT can, and does, work in some newer BIOSs but not all.
3) I have never seen, or heard of, any instance where an OS installed in Legacy BIOS is visible on a UEFI boot. Please verify your install of Windows 7 is installed on BIOS and is an option on Grub EFI.
4) AFAIK Windows does not recognise non MS OSs in its bootloader, to have multiple options that include non MS OSs you must use a non MS bootloader as the primary bootloader (i.e. GRUB) which will then initiate the MS bootloader (NT bootloader) to boot MS OS installs. As mentioned above by someone else using os-prober will let GRUB know if there are other OSs installed.
5) Using a VM is a drain on RAM, you need enough RAM to run the host OS and then enough to run the Virtual OS inside the VM. If you are using a VM to run an MS OS most of your RAM will need to be reserved for the MS OS. In my experience unless you have alot of RAM this will negatively affect performance. There is a general move towards Hypervisors (Zen being an excellent open source option) but even these are host machines with virtualised OSs and the same RAM issues apply.

On 1 January 2017 at 13:40, Felmon Davis <davisf@...> wrote:
On Sat, 31 Dec 2016, Greg Madden wrote:

updating/installing grub might solve the lack of grub boot screen. I
would use the 'dry-run' option..os-prober is the part that looks for all
the other OS's installed so grub can build a multiboot scenario.

certainly worth a try!

Debian has no issues with uefi, at least stretch.


ps multiboot is the old way, if you have the hardware, virtualization
works great. I use Debian with Win7 as a guest..runs fine..caveat, I
have an OEM Win7 disk.,

yeah, I have a VM running under NetRunner too. I bought a copy of Windows 7 pretty cheap and got a license.

for no good reason, maybe mainly just lack of familiarity with VM, I'm inclined to keep 'the old way' available.

I do agree that the VM works nicely. I need it to work with the school's classroom projectors (hdmi) and this I haven't tested yet.


Felmon Davis

For courage mounteth with occasion.
                -- William Shakespeare, "King John"

To unsubscribe, e-mail:
For additional commands, e-mail:
Read list messages on the web archive:
Please remember not to top-post: