Today I finally made the big step and installed Ubuntu to my primary productive system. While there is still a Windows 8 "fall-back" system on sda1, Ubuntu was installed to sda5.
I think installing grub to my sda1-partition (which hosts Windows) was a mistake, since I am no longer able to boot into Windows. However, grub shows up, displaying entries for Windows 8 and Ubuntu (and for some strange reason even my old Windows 7 installation which used to be installes on sdc1), but when I select Windows 8 grub proceeds, a blinking cursor shows up and the system dies. After I obviously crashed the entire system, I was finally able to restore grub so far that I am now able to run Ubuntu again.
I tried recovering Windows following both paths described in this tutorial -> https://help.ubuntu.com/community/RestoreUbuntu/XP/Vista/7Bootloader (i.e. I tried using a Windows repair disk and fixing the MBR with bootrec and I tried repairing it using a Live-Ubuntu with Boot-Repair.) Unfortunately, this approach did not work. Does any one have an idea how I can get back into my Windows?
Here is my current system setup:
sda - 256 GB SSD sda1 - NTFS, Windows 8 sda5 - ext3, Linux system, mounted to / sda6 - Swap sdb - 500 GB HDD data storage sdb1 - NTFS sdb2 - NTFS sdc - 500 GB HDD sdc1 - ext3, data storage for linux, mounted to /home sdc2 - NTFS, stores a fresh acronis windows backup
A Boot-Repair Boot Info Script can be found here -> http://paste.ubuntu.com/6189046/