Debian systems:
The Debian GNU/Linux distribution uses its own package management system. It is therefore necessary to convert the RPM to a native Debian installation package, before installing it.
Firstly, install the alien package, used to convert other package formats for use on Debian.
apt-get install alienConvert the downloaded RPM to a Debian package.
alien vnc-E4_2-x86_linux.rpmInstall the resulting Debian package.
dpkg -i vnc-e_4.2-2_i386.deb[If necessary, install the libstdc++2.10-glibc2.2 package, which provides the libstdc++-libc6.2-2.so.3 library, required by VNC Enterprise Edition]
apt-get install libstdc++2.10-glibc2.2Solaris
Copied and pasted from: http://www.realvnc.com/products/enterprise/4.2/unixinstall.html
Good luck.