this is an unsecure session

[Roy John Little <rlittle@ciens.ula.ve>]

Dear list:
I have just upgraded from Debian 2.1 to 2.2 by way of apt-get
upgrade-dist, and all was upgraded successfully, as far as I could tell. 
I decided to reinitiate the session.  The login prompt with the banner
background appeared, with the disturbing difference that, instead of
saying "Debian GNU/Linux" I got "This is an unsecure session," and I
cannot login now as root or as anyone else.  I have booted from the rescue
disk and mounted my previously installed partition but am at a loss as to
what file to edit to recover my ability to login.

Thanks for any help you can give me.

Prof. Roy J. Little
Dept. Chem.
Facultad de Ciencias
Universidad de los Andes
Merida, Venezuela