This question already has an answer here:
After installing ubuntu using wubi and selecting
UEFI and csm UEFI as disabled in samsung series 5 with window 8, wubi said files is missing.
Do i need to install with wubi again?
i read the answer, it said to use livecd, but i only hope not actual install in partition, only expect wubi in windows 8, after read, it is quite terrible to install partition with livecd , it said choose anything you want during installation, but i already installed in window 8 already. Why install again using livecd. finally it said it may not boot window 8 any more. is it possible to keep using window 8 boot manager to boot ubuntu?