[mythtv-users] converting a .20.2 database to .21

[scram69]

I'm thinking through my usual procedure for upgrading my backend
distro, and I believe I've run up against a problem.

In the past, I've installed a newly released version of Ubuntu on a
separate partition on my OS drive.  Once I have Myth installed and the
OS is tweaked the way I like, I boot back to the old partition, dump
mythconverge, reboot to the new partition, load up mythconverge, and
off I go.

However, the latest version of Ubuntu (8.04), installs Myth 0.21.  I'm
guessing that I can't just load up the database that I dump from
0.20.2 running under 7.10 into 0.21.

I understand that if I were to simply point to backports and upgrade
to 0.21 under 7.10, part of the process would convert my 0.20.2
database to 0.21.  Does anyone know of a way I can do this as a
stand-alone procedure?  i.e. backup my 0.20.2 database, run a
conversion script on it, and then point my 0.21 installation at it?