Problems shrinking Windows partition to Install Ubuntu ?

IrishWolfHound93

Reputable
Dec 18, 2014
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I'm currently trying to install Ubuntu to run alongside Windows 10 but I'm having trouble with shrinking my C: Partition in Disk Management .

Total size before shrink : 461204
Size of available shrink space in MB : 20071
Enter the amount of space to shrink in MB : 20071

Ideally I would like to allocate more space to Install Ubuntu, but it only lets me shrink the volume by 20071 for some reason . I have a 500GB hard drive (450GB) and 195GB free space on C: .