I just did the following and here are my results.

apt-get install libnet-ssleay-perl
Reading Package Lists... Done
Building Dependency Tree... Done
Sorry, libnet-ssleay-perl is already the newest version.
0 packages upgraded, 0 newly installed, 0 to remove and 0  not upgraded.

> 
> apt-get install libnet-ssleay-perl
> 
> That will install the module you're trying to get.
> 
> ciao,
> 
> der.hans