Launch it using Alt + F2 , and typing gparted . In order to expand the 63GB partition, you must have unallocated space adjacent right to this partition.
Because Ubuntu uses an LVM volume, the size of the volume needs to be changed first before the resize2fs can increase the size of the underlying file system.
In the toolbar underneath the Volumes section, click the menu button. Then click Resize Filesystem… or Resize… if there is no filesystem. A dialog will open ...