recovering from security kernel-image update

[Geoff Thurman <geoffthur@ntlworld.com>]

Dear all,

My system is broken following yesterday's security kernel-image update. I am 
able to boot in using a rescue disk, but am unsure what to do next. The 
obvious thing is to simply do an apt-get update and upgrade and let the bad 
kernel get repaced by the one I believe the security team have already sorted 
out for us, but I am worried that this might somehow make matters worse. I'm 
sorry if this is so obvious as to be stupid, but is there something else I 
should do beforehand please?

Thanks for any help,

Geoff