First comment on the video - from the maker of the video - is " FIX (worked for me): write Ubuntu ISO to USB flash with dd"

So, yeah. Okay.

(Speaking as ex-Canonical, and still Ubuntu user. I upgraded my ThinkPad 2 days before release, and it was a catastrophe I had to manually un-fudge with the help of the apt maintainer. It was a packaging problem).

My feeling on this particular release is that it was rushed out, and should probably have been kept back for a month or two. The xz and t64 (2038) issues occupied some unexpected time this cycle.

Also, there used to be a dedicated QA lab which did a whole slew of automated tests. I don't believe that still exists.

Also, also. The Ubuntu community has shrunk, which means fewer people doing QA.

Also, also, also. The guy running the desktop team left the day after the release. Read into that what you will.