Before creating a partition, boot into rescue mode (or unmount any partitions on the device and turn off any swap space on the device).

Start parted, where /dev/sda is the device on which to create the partition:

parted /dev/sda

View the current partition table to determine if there is enough free space:

print

If there is not enough free space, you can resize an existing partition. Refer to Section 12.1.4, “Resizing a Partition” for details.