Noninteractive "apt-get upgrade "question.

[Ivan Teliatnikov <ivan@geosci.usyd.edu.au>]

What is the best way to "apt-get update" a classroom full of debian
sarge machines. 

I tired using

apt-get update
DEBIAN_FRONTEND=noninteractive apt-get -uy dist-upgrade

Nevertheless I was asked some questions as follows:

Configuration file `/etc/profile'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : background this process to examine the situation
 The default action is to keep your current version.
*** profile (Y/I/N/O/D/Z) [default=N] ?

I have already tested the most recent updates and I want everything to
happen non-interactively.

What is the best way?


Thank you in advance.