Ubuntu 8.04 installer will not launch.

[Plover]

I'm running ubuntu 8.04 64bit.

I've tried both the beta RegnumOnlineInstall_64 and 32, and the official rolauncher, and all 3 return without an error or anything.
I've set them all to be executable.
Using terminal, anything I try to do on the rolauncher says file/directory does not exist.
I've tried the MALLOC_CHECK_=0 and =1 with the two beta installers. For the 32 bit, it returns without error or success, and for the 64 it returns with "Segmentation Fault".
I've tried G_SLICE=always-malloc ~/Desktop/RegnumOnlineInstall_64, which returns "Segmentation Fault" for the 64, and returns nothing for the 32.
I've tried sh ~/Desktop/RegnumOnlineInstall_32 which gives "1: Syntax Error : "(" unexpected". The same error occurs for the 64bit.

These are all the suggestions I've found on the forum. Perhaps somebody has something I'm missing? How do you "install as root"? (is this the solution?)

Thank you!
-Plover