Hi Symon,
which Linux do you use to install your SAP system? SAP is not supported on all Linux versions.
Some posts before you mentioned that you want to install "light" version of netweaver...
Maybe you could have a look at
http://www.sdn.sap.com/irj/scn/nw-downloads
there are "light" versions of netweaver, even an older (2004s) Linux version.
Best regards
Christian