Should I align partitions on an SSD, if so how do I do it at install time?

What advantages does it truly bring to have an aligned partition on a SSD?

Basically it's all about better performance. If it's really such a big deal with current generation SSDs - who knows, but aligning the partition won't hurt.

Anyways, Ubuntu's installer automatically aligns the partitions correctly. The first partition starts at sector 2048, that is after 2048 sectors á 512 Bytes = 1 MiB, and 1 MiB is evenly dividable by all common SSD block sizes.