changing from BIOS to GPT
I have a computer that was set up with an the older style partition
table and wanted to convert it to GPT. Since the first partition started
at 2048, I figured this wouldn't be a problem. Just use gdisk to write a
new partition table after stealing some space from swap for an EFI boot
partition. Then reconfigure grub...
The HD originally had all 250G dedicated to Windows 7/Pro 64 (the way I
got it - not my choice). I shrunk that down to the smallest Windows
would allow - 137G - and created new Linux and Swap partitions that I
installed Jessie to. These were extended partitions that gdisk converted
to primary (it displays them as primary but with the original numbers).
Now I don't even to get a grub rescue prompt. I've tried reinstalling
grub in a chroot after booting with system rescue cd but that didn't
work. I've reinstalled grub to /dev/sda but again without success.
Update-grub sees the partitions but doesn't give me a bootable system.
BTW: Grub is the grub-efi-amd64 package.
At one point I did get it to boot after using F12 to bring up a boot
menu and booting from the first HD, but I haven't been able to repeat that.
I'm running Jessie/64.
Any ideas?
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