How can I split an existing partition (NTFS) to get space for a new partition and create a mountpoint for it?
You need to boot from a live CD or USB and use gparted to partition your drive. It should be called something like
Read through this tutorial for gparted - it should tell you everything you need to be able to:
You should take a note of the device path of the partition you create (eg.
To permanently mount this partition, you need to edit /etc/fstab. Before you do, make a copy to back it up in case you mess it up somehow. To edit /etc/fstab, press Alt+F2 and enter
Once opened, add this line to the end of the file:
but obviously you need to use your specific information instead. Once you have done this, save and close the file. The partition will now be mounted to the specified path every time you start up the computer.