askubuntu.com/review/low-quality-posts/1049085 is actually trying to answer the question, but it has serious quality problems. Perhaps an edit is possible based on the information in the post author's comment?
@Zanna Thanks! I've flagged the first and third comments as no longer needed. I'm not sure about the second one.
@Zanna I recall that answer being CW when I first saw it.
Going by askubuntu.com/posts/1242985/revisions, it looks like the post author clicked the CW checkbox initially, or within the 5 minute grace period after initially posting it.
Of the tab where you can flag comments and the tab where you cannot, is one of them showing the post and its comments as a review item and the other not?
dupeSolved! I read @Pilot6 suggestion in another comment to disable secure boot and that did the trick. Do I need to leave secure boot disabled? All is well.