Hi David.
Yes, I made the labels for the partitions during the original installation:
/dev/sda1 = / (primary partition)
/dev/sda2 = (extended partition)
/dev/sda5 = swap (logical partition)
/dev/sda6 = /home (logical partition)
So /dev/sda2 has no label, as it is just an extended partition, which "holds" logical partitions:
/dev/sda5
/dev/sda6