Default theme missing after todays updates.

[DAVID BENTLEY]

Todays updates cause a major problem in that you can't
login because the Default theme is missing from the
following location :-
/usr/share/gdm/themes/Default

The solution is to boot in text mode (edit the boot
for the kernel that runs [latest kernel panics but
that another story] and add a 3 so it looks like rhgb
quiet 3 and then boot)

When you are in login as root and re-crate the default
folder by copying the Blucurve one and re-naming it to
Default.

logout and re-boot and all will be well again.