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I am new to Linux. I was trying to dual boot windows 8.1 and ubuntu when I came across this: ubuntu installer won't recognize windows as an OS and the C drive is recognized as "unallocated space" by ubuntu. How can I install Ubuntu alongside windows? I tried installing before, when windows 8 was UEFI, I now reinstalled windows 8 and it's not UEFI now, what should I do?

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anyone? please, I am quite desperate getting an answer now – xXJJJasonMokXx Jun 5 '14 at 9:51
Have a look at Partitions not showing while installing (K)ubuntu 14.04. If it does not solve your problem, then post a screenshot of the partitions in Windows Disk Management (like this) – bain Jun 5 '14 at 13:00

Try to resize your C partition under Windows using the built-in disk management (just use the search function of Windows 8). Then select your C drive, right-click on it and choose Shrink Volume.... You will have to enter the amount of MB you want to shrink your C drive. Note that you have to leave some free disk space for Windows. Then reboot and repeat the installation of ubuntu; now the free space will be recognized by the installation routine.

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