Can't upgrade LyX on Focal Fossa

[Paul A. Rubin]

Hi all,

I just updated my laptop from Linux Mint 19.3 (based on Ubuntu Bionic 
Beaver) to 20.0 (based on Ubuntu Focal Fossa). During the update, LyX 
2.3.4.2 (the current version from the Canonical repo) was installed. I 
added Liv's PPA (with no error messages) and updated the cache, but Mint 
still thinks 2.3.4.2 is the most recent version. The PPA info looks 
correct to me ("http://ppa.launchpad.net/lyx-devel/release/ubuntu focal 
main"), so the only thing I can think of is a configuration glitch in 
the PPA. I noticed that the Focal version there ends with "~ppa2" rather 
than "~ppa1", but that's not unique to Focal so I doubt it's the problem.

Is anybody else having problems upgrading to 2.3.5.1 for Focal via the PPA?

Paul