Unable to update Ubuntu because /root is too small

Question

I have 14.04 LTS and when it was installed there were three partitions it looks like from Gparted.

1. Is /dev/sda1 which is the /root
2. Is /dev/sda2 which is Extended and does not show anything for mount. (the size is the total drive size which is 1.8Tb)
3. Is /dev/sda5 which is lvm2/pv and mounted as ubuntu-vg (this also shows as 1.82Tb but also shows 1.82Tib used.

When I look at the graphical display it shows the root as 256 mb over all three partitions. I think I need to expand that but how?

Thanks