Regarding my comment #13 at duplicate bug #1050940 I now believe (after much investigation & help from others) that my issue was actually more firmware related than due to a bug in Ubuntu.
What had happened is that I installed Ubuntu Trusty in UEFI mode alongside Windows 8.1 (made sure that the live DVD booted in UEFI mode) but after installation the machine just booted straight into Windows 8.1. I knew however that you could display the BIOS boot menu pressing F10 so I did so, but Ubuntu did not show up anywhere in the boot menu, and selecting any of the other options either booted straight into Windows or did nothing at all.
I then ran Boot Repair just to collect a boot info summary and next actually ran the Boot Repair recommended repair (also collecting a second boot info summary when complete) and still the machine would just boot straight into Windows with no intervention, but if I pressed F10 at boot Ubuntu did now appear in the BIOS boot menu and selecting that showed the grub boot screen as it should with both Ubuntu and Windows - both of which worked OK.
It was at that point that I made the assumption that I'd been affected by duplicate bug #1050940 but I followed up by asking a question at the forums, and after following the instructions provided by oldfred I now get the grub boot menu at boot with no intervention:
Sadly I still don't 100% understand what went wrong, or what exactly I did to fix it, but I now assume that I was mistaken about being affected by this specific bug.
Sorry, there's just a huge learning curve involved in learning UEFI basics and to be honest I'm not 100% certain which of my assumptions is correct and which is not.
BTW I'd have been glad to collect actual logs rather than just posting the pastebin links but I was unsure what was needed or where to find it :^(
Regarding my comment #13 at duplicate bug #1050940 I now believe (after much investigation & help from others) that my issue was actually more firmware related than due to a bug in Ubuntu.
What had happened is that I installed Ubuntu Trusty in UEFI mode alongside Windows 8.1 (made sure that the live DVD booted in UEFI mode) but after installation the machine just booted straight into Windows 8.1. I knew however that you could display the BIOS boot menu pressing F10 so I did so, but Ubuntu did not show up anywhere in the boot menu, and selecting any of the other options either booted straight into Windows or did nothing at all.
I then ran Boot Repair just to collect a boot info summary and next actually ran the Boot Repair recommended repair (also collecting a second boot info summary when complete) and still the machine would just boot straight into Windows with no intervention, but if I pressed F10 at boot Ubuntu did now appear in the BIOS boot menu and selecting that showed the grub boot screen as it should with both Ubuntu and Windows - both of which worked OK.
It was at that point that I made the assumption that I'd been affected by duplicate bug #1050940 but I followed up by asking a question at the forums, and after following the instructions provided by oldfred I now get the grub boot menu at boot with no intervention:
http:// ubuntuforums. org/showthread. php?t=2264348& p=13223803# post13223803
Sadly I still don't 100% understand what went wrong, or what exactly I did to fix it, but I now assume that I was mistaken about being affected by this specific bug.
Sorry, there's just a huge learning curve involved in learning UEFI basics and to be honest I'm not 100% certain which of my assumptions is correct and which is not.
BTW I'd have been glad to collect actual logs rather than just posting the pastebin links but I was unsure what was needed or where to find it :^(