As a side point but relevant to finding out what release you're using, lsb_release -a is somewhat out of date. I tried it on my machine running Debian Squeeze (testing) and got this
$ lsb_release -a
LSB Version: core-2.0-ia32:core-2.0-noarch:core-3.0-ia32:core-3.0-noarch:core-3.1-ia32:core-3.1-noarch:core-3.2-ia32:core-3
Distributor ID: Debian
Description: Debian GNU/Linux 5.0 (lenny)
I guess the lsb_release package hasn't been updated since the Lenny->Squeeze changeover.