I am trying to dual boot Ubuntu with Windows 10, which is currently installed.

My partition table looks like this:

Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags: 

Number  Start   End    Size   Type     File system  Flags
 1      1049kB  368MB  367MB  primary  fat32        diag
 2      368MB   735MB  367MB  primary  ntfs         boot
 3      735MB   860GB  859GB  primary  ntfs
 4      860GB   860GB  472MB  primary  ntfs         diag

partition 1 is a OEM partition, 2 is System Reserved, most probably for windows; 3 is my Windows C: drive; and 4 is a Windows recovery partition.

I have about 130GB of unallocated space which I would want to install Ubuntu on. However, when installing , the free space is considered "unusable" and I cannot dual boot/install Ubuntu. After Googling this, it appears that only 4 partitions are allowed. I do have a Windows recovery disk. Which partition OEM or Windows Recovery (Since I have a recovery disk) (1 or 4 respectively) should I remove?



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