Hi zohaib,
i installed ubuntu 12.04 64-bit wit 50gb and 8gb swap. now i had 450gb in C 50gb in F n 500gb in S(ignore drive alphabets). the problem is boot menu option is not coming for dual boot. if secure boot off ubuntu is getting boot if turned OFF win8 getting boot. where i made mistake. if any quries ask me here.
Thanks
venkatesh