Let me preface this by saying that I have no Linux experience at all; I really want to learn, but this is my first exposure.
Trying to dual boot Ubuntu 14.04 on my Asus K55a laptop. The laptop came preinstalled with Windows 8. I did a clean install of Win7. This install was in legacy bios, not UEFI. I tried to install Ubuntu 12.04 off a flash drive but the installation did not detect an existing OS, just one huge unallocated partition. When I checked the flash drive from the bios settings it was identified a UEFI drive. I assumed that the trouble I was having was because Win7 was a legacy bios install and Ubuntu was trying to install as UEFI.
I tried to start from scratch. I made a UEFI Win7 flash drive, installed from that. Tried to install Ubuntu 14.04 from a UEFI flash drive, encountered the same problem. I did some searching and found a thread with a similar problem on the Ubuntu forums with the following instructions for making the Windows system visible:
Open Terminal and type the following:
sudo dd if=/dev/sda of=sda.mbr bs=512 count=1
To clear the GPT signatures you'll need gdisk by typing: sudo apt-get install gdisk
sudo gdisk /dev/sda
Switch to expert mode: x
To "Zap" GPT enter: z
The selection for the first question Y and answer N for MBR!!
I followed these instructions and I think it erased my Win7 install/partition, because if the Ubuntu flash drive wasn't in when I tried to boot up it would only boot into the bios menu. It gave me some warning about "No bootable device."
1) What is the problem with Ubuntu not recognizing the existing OS? 2) Did I erase my Win7 installation/partition when I followed those instructions above? 3) Can I resolve this issue if I've already reinstalled Win7, or will it require starting from scratch? 4) How do I fix this?