partitioning - How do I create partition in Ubuntu?

I have a 2TB hard disk with Ubuntu 14.04 . Some 1.5 TB is used . I did not create any partitions during installation time of Ubuntu 13.10 . I upgraded to 14.04 but after upgrading there are some hang/crash problems . How to I create seperate parition like C: drive in Windows and other drive for just my data ( videos etc ) without losing data . After this I want to perform clean installation of 14.04.1 .

Here is output of sudo parted -l

Model: ATA WDC WD20EZRX-00D (scsi) 
Disk /dev/sda: 2000GB 

Sector size (logical/physical): 512B/4096B 
Partition Table: msdos 

Number    Start    End       Size    Type       File system     Flags 
1         1049kB   2048MB    2047MB  primary    linux-swap(v1)  boot 
2         2049MB   2000GB    1998GB  extended 
5         2049MB   32.4GB    30.3GB  logical    ext4 
6         32.4GB   2000GB    1968GB  logical    ext4