So... I wanted to mount a virtual environment of Windows 7 on VirtualBox. I found out I had to turn on "Virtualization" on the BIOS. So, I went to the BIOS and enabled Virtualization. Then reboot the computer, it showed some HP repair messages which I accepted, and now It goes directly to Windows 8. Can't find the way to boot into linux.
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The only thing that worked for me was installing boot-repair on a USB and booting from it. I found out that whenever I make a change in the BIOS and "Exit and save changes", I'd lose access to Ubuntu, looks like Windows "fixes" the boot and then I can't access GRUB.