I remember having a heck of a time installing Kubuntu side-by-side with Windows 8, because 8 uses UEFI, and that screws it up somehow. What I do know is, when I start my computer, I'm taken to a GRUB menu. From there I can pick windows 8 if I wanted to.
Kubuntu 15.04: it should be 64-bit to be UEFI (since Windows is UEFI, you should also run Kubuntu UEFI).
When you installed Kubuntu 15.04, did you run the installer DVD/USB in UEFI mode? You should!
Install the Kubuntu OS in UEFI mode
--> Must be 64-bit Kubuntu OS for UEFI. I am using Kubuntu 14.04, 64-bit.
(Credit: I was lucky to be forewarned about this by another member, Ron Morse, at another forum, and given some tips and things to watch for.)
Important: You must make certain you are installing Kubuntu in UEFI mode.
I used a Live DVD Kubuntu installer.
Install the DVD in the optical drive, reboot the PC, enter UEFI(-BIOS) by pressing F2.
Under Advanced, find the ASUS boot menu, and the "boot override" menu under that.
The bootable devices will be listed.
Choose the one that corresponds to the Kubuntu UEFI choice.
Look for UEFI / FAT) or some reference to UEFI.
My Live Kubuntu DVD installer showed up twice in UEFI BIOS (under Boot Override) as a "normal" DVD writer, and also as:
UEFI (FAT) TSSTcorp CDDVDW SH-224DB (1028 MB) (= my Samsung DVD player).
Found out you may have to re-boot a time or two for this to appear correctly, so I think.
Select that option from the boot override menu.
The PC will re-boot, and you will see a text mode screen with a grub-like menu. Select install O/S. If, instead, you see the full graphical setup menu, the installer is probably in legacy BIOS mode so reboot, enter the UEFI setup, navigate to boot override and try again.
(Credit: I was lucky to be forewarned about this by another member, Ron Morse, at another forum, and given some tips and things to watch for.)
Important: You must make certain you are installing Kubuntu in UEFI mode.
I used a Live DVD Kubuntu installer.
Install the DVD in the optical drive, reboot the PC, enter UEFI(-BIOS) by pressing F2.
Under Advanced, find the ASUS boot menu, and the "boot override" menu under that.
The bootable devices will be listed.
Choose the one that corresponds to the Kubuntu UEFI choice.
Look for UEFI / FAT) or some reference to UEFI.
My Live Kubuntu DVD installer showed up twice in UEFI BIOS (under Boot Override) as a "normal" DVD writer, and also as:
UEFI (FAT) TSSTcorp CDDVDW SH-224DB (1028 MB) (= my Samsung DVD player).
Found out you may have to re-boot a time or two for this to appear correctly, so I think.
Select that option from the boot override menu.
The PC will re-boot, and you will see a text mode screen with a grub-like menu. Select install O/S. If, instead, you see the full graphical setup menu, the installer is probably in legacy BIOS mode so reboot, enter the UEFI setup, navigate to boot override and try again.
If the HDDs are OK, that leaves the possibility of a bad partition/partition table, so it seems; and the problem seems to be sdb. gdisk should be able to help here -- read that link I gave on the 5 experiments, and maybe check the Rod Smith link about gdisk.
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