It might depend on what Linux distribution you are using; probably the easiest way to go is to use your distribution's package management utility and look for SOAP::Lite.
Another way would be to rely on CPAN. Try to run

perl -MCPANPLUS -e shell
[download]

or

perl -MCPAN -e shell
[download]

and see what you get, afterwards install SOAP::Lite.

To try a minimum install is of course possible too; anyway, be prepared to encounter real difficulties for solving dependencies properly - at least in my experience, more often than not it's more trouble than it's worth.