Screensaver issue

[MR ZenWiz]

I was running Xubuntu 18.04 until a little while ago (within the last
few weeks) when I upgraded to 20.04.  I was using xscreensaver and had
to uninstall it and reinstall it for it to work.  It seems that the
new version is part of the release but I had some issues with it.

The first issue was that the xfce4-screensaver kept coming back and
taking over.  I went to Session and Startup settings to take it out,
and it came back again uninvited.  I've taken the second one out and
now it seems to be more benevolent - it's not coming back again
anymore.

However, the new xscreensaver does something I haven't seen for a long
time.  When I unlock the screen, there are a series of messages in a
tiny font in the upper left side of the screen until the unlock
completes.  they look like this (transcribed from a photo, so I hope
this is correct):

xscreensaver: unloadable, unparsable font: *-*-dina-bold-r-*-*-10-*-*-*-*-*-*-*
xscreensaver: unloadable, unparsable font: *-*-dina-bold-r-*-*-10-*-*-*-*-*-*-*
xscreensaver: unloadable, unparsable font:
*-*-dina-medium-r-*-*-10-*-*-*-*-*-*-*xscreensaver: unloadable,
unparsable font: *-*-dina-medium-r-*-*-10-*-*-*-*-*-*-*
xscreensaver: unloadable, unparsable font: *-*-dina-bold-r-*-*-10-*-*-*-*-*-*-*
xscreensaver: unloadable, unparsable font:
*-*-dina-medium-r-*-*-10-*-*-*-*-*-*-*
xscreensaver: unloadable, unparsable font:
*-*-dina-medium-r-*-*-10-*-*-*-*-*-*-*

I looked this up in Google, but the answers are greek to me and I
don't see the connection to xscreensaver.  I did try xset fp rehash,
but that doesn't solve the issue.

Does anyone know?

Thanks.

Mark