To run a program with root access, you should use the "sudo" command. To use it, type in "sudo (command to run as root here)" The second argument, which is "(command to run as root here)" is necessary to use sudo. At first, it gives you usage gibberish, and then asks for your password. You then enter your password.
Perhaps now to remove sda5 you should try using fdisk.
Run the command "sudo fdisk"
You should have this fdisk manual open in your web-browser: http://tldp.org/HOWTO/Partition/fdisk_partitioning.html

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