In BIOS, I disabled "secure boot" and enabled "UEFI mode".This is boot-repair output: (this one was run after booting sda2 lubuntu from a refind usb disk, but I also tried with live CDs with the same results) If I start the system with a refind USB disk I can successfully load lubuntu. My guess is that windows put a boot loader somewhere else than /dev/sda. I even tried chrooting and grub-installing on /dev/sda, but I don't think that grub is the boot loader loaded at startup. I installed esayBCD on windows and now I see its boot loader, but not grub. I disabled windows' "quick boot" feature, then run boot-repair, but it doens't fix the issue (it used to work when windows 8 messed the boot config, but not with windows 8.1). I have a sony vaio duo 11 convertible, it was successfully dual booting lubuntu 13.10 and windows 8, but after the upgrade to windows 8.1 it doesn't load anything but windows.
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