Hi,
I've got Labview 7.1 working with Ubuntu 6.06. It was a total pain but anyway I think you'll have similar problems on Labview 8.
The missing shared library problem can be sorted out by downloading a package from http://packages.ubuntulinux.org/cgi-bin/download.pl?arch=amd64&file=pool%2Fmain%2Fd%2Fdb1-compat%2Flibdb1-compat_2.1.3-7_amd64.deb&md5sum=989e86e217ad34b1e46bf644bd1183a3&arch=amd64&type=main
It's a library to manipulate database files. It's not the latest version but it doesn't appear to mess up anything else.
The next problem you'll hit is that the installer script craps out for various reasons. Trying to install the RPM's manually by downloading RPM for ubuntu doesn't work as RPM will moan about various things not being installed because they were installed via .deb packages/apt, (so RPM doesn't know about them). RPM even complained that I didn't have a bourne shell installed even though I had! Anyway NI have given you rpm2cpio to change the rpms to cpio files. I didn't have much luck doing that either so I used a program called alien,(download through Synaptic package manager), to convert the rpm's to .deb packages "alien -k rpmpackagename.rpm". Next use "dpkg -i resultingdebianpackage.deb". If all went well then labview is installed to /usr/local/lv70/labview.
Anyway I hope this helps.
Regards,
John Cahill