Ubuntu – Unable to extend partitions using GParted

You must run gparted from a livecd because you will be moving the partitions.

1. Backup your data (there is an high risk if something goes wrong during partition changes)
2. Move sda3 to the beginning of the unallocated space

3. Move sda4 to the beginning of the unallocated space

4. Resize sda4

The message indicates that your are running low of memory. The current need is only satisfied with enabled swap space.

Most likely is that you loaded the LiveUSB content into ram at boot time. Check the boot menu and deselect this option.

Some further remarks

As I see in your question, the swap space is not inside the partition you want to resize. So with a little bit luck you haven't the need to disable the swap space. Give it a try.

Generally I would consider to use LVM instead of bare partitions. The "space management" is a lot easier and you can do it online without LiveUSB :-)

You can increase a partition if you have enough free space allocated for the LVM volume group. If you run low of space in a volume group you can simply add a new physical volume to the volume group. So you work around the problem that you have to repartition your disk.