Upgrade from 19.10 to 20.04 failed - upgrade process broken

[Bret Busby]

Hello.

On a computer running UbuntuMATE 19.10, the Software Updater showed
that the upgrade to 20.04 is available, so I selected the Upgrade
option.

After downloading the (about) 2.4GB of packages - around 2313
packages, it started installing them, the started displaying error
messages, stating that packages are not found, and that dependencies
are unmet, so the partial upgrade could not complete.

I have a screenshot of the last screen of he process, but I do not
know whether I can post attachments to this list.

Anyway, the upgrade process from 19.10 to 20.04, is broken.

Oh, and, at the start of the process, just before I confirmed the
upgrade to occur, a dialogue bos stated that it is (now?) the
development version of 20.04, for testing - indicating that 20.04 has
not yet been formally released.

So, the upgrade process, which appeared to have been formalised and
finalised, appears to be buggy.

-- 
Bret Busby
Armadale
West Australia
..............