Note: This has been resolved. The source isn't current for my purposes, so I'm dismissing it.
I was looking for a source about the superuser and came across this entry from the community wiki.
The entry has the following disclaimer at the top:
March 14, 2019. PLEASE NOTE: This wiki article is being significantly rewritten as it contains a good deal of old, dated, and possibly questionable material. Using caution and consulting with others on the Ubuntu Forums or Ask Ubuntu is highly recommended!
The source looks like what I was looking for. However, if it's not current, it's of no use to me.
Could anyone tell me whether this entry is current?