What do I do now? Windows 7 and 10 are installed and I can't install on the free space shown as unusable below.
1 Answer
From screenshot it is clear you have four primary partitions.
Refer Disk partitioning:
The total data storage space of a PC HDD can contain at most four primary partitions, or alternatively three primary partitions and an extended partition.
To rectify this, you would need to remove a partition, replace it with an Extended Partition, then use logical partitions within that Extended Partition to get more than 4 partitions onto the drive.
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Please let me know if you solved and you can accept the answer by clicking tick at left of this answer @MichaelWong– RavanJan 7, 2016 at 7:13
sudo fdisk -l