I recently purchased an Acer Aspire M5-581T that came with Windows 8 preloaded.
After several attempts at trying to install Ubuntu 12.10 64-bit, I finally managed to boot from a LiveUSB and install it. However, due to Windows finicky UEFI setup, this didn't all go as planned.
In order to boot from a LiveUSB, I entered my BIOS and changed the boot mode from UEFI to Legacy BIOS. This allowed me to change the boot order and properly install Ubuntu 12.10 onto my partitioned drive.
Ubuntu was working fine, but when I rebooted, there was no GRUB menu asking whether I'd like to load into Windows or Linux. It simply loaded me directly into Linux as if Windows wasn't there.
I figured it was due to my being in Legacy BIOS boot mode, so I changed it back to UEFI. Then, only Windows would load, with no menu for choosing Ubuntu.
In retrospect, I'd have kept this over the disaster that is currently my computer. I went back into Linux by switching into Legacy BIOS again and install boot-repair. I ran it on the Recommended Settings, thinking it would install my much needed boot menu. It didn't.
Now, I can't get either OS to load. When I reboot in UEFI, I get errors stating:
Windows Boot Manager has been blocked by the current security policy and then
HDD0: has been blocked...etc. I can't disable Secure Boot while still loading in UEFI mode.
Booting in Legacy BIOS leaves me in the grub rescue prompt with the error
Prior to rebooting after running boot-repair, I was given the pastebin: paste.ubuntu.com/1618833 and was told that my
.efi file was located in
I am becoming desperate. Please advise me in loading into at least one of my operating systems...
NOTE: I have read many of the similar posts, but none address the problem with necessary depth. Most others' problems were solved by boot-repair, not caused by it.