The issue is probably within the routing table. Your 192.168.0.2 laptop doesn't know a way to get to your 10.x network. You might need to add a route to your laptop specifying how to get to the 10.x network.
Eg. route add -net 10.0.0.0/24 netmask 255.255.255.0 gw 192.168.0.1
or try possibly specifying 192.168.0.1 as the default gw on your laptop.
However, without a firewall on the debian box you have nothing protecting your 10.0.0.0 network from the 192.168 network and visa-versa (not a big deal if it's a home network.. but if it's a company, this would be an issue.)
Hope this helps.