Upgrade is complete. Please let us know if you have any problems.
Note - for those of you that were using Two Factor Authentication, due to the way lemmy 0.19.x implements 2fa, you will need to re-enable it manually from your settings once you have logged in.
Edit - As a bonus, we have two new interfaces for folk to try
https://alx.lemmy.blahaj.zone
https://mlmym.lemmy.blahaj.zone/
Another thought. Community titles (the title that shows in the URL, not the display title) are limited to 25 characters. If you're going beyond that, it fails, and from memory, it failed without a useful error message in previous versions of lemmy, so it's probably still doing that now.
Oh I see, yeah that seems to have been the big issue. Thank you for the help! Its created now!