Please do the following, substituting appropriately where I've used {}.
I've just performed these steps on my Red Hat box and logged/saved everything
for reference.  I'm using the Foundation installer bin file from my
Enterprise CDROM.

Open an xterm window for the user which will run JBuilder. Don't use root.
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$ cd /tmp
$ script foobar.log
$ df -k .
$ df -k ~
$ which ls
$ which uncompress
$ which dd
$ which df
$ which rm
$ which dirname
$ which basename
$ LAX_DEBUG=file /bin/sh -xv {/mnt/cdrom/linux_sol/fnd_linux_install.bin}
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If the installer launches, install JBuilder Foundation into your home
directory.  When you get to the last page of the installer, where it
says it completed, pause, do the following in a different shell window.

If the installer didn't launch, do the following if the files are present:

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$ cp env.properties.{*} save.env.properties
$ cd /tmp/install.dir.{*}
$ cp install.log.temp ..
$ cp sea_loc ..
$ cp temp.lax ..
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Now exit the installer by clicking its button.

Now, in the window you ran the installer from, close the script log:

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$ exit
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Now you have a bunch of stuff in /tmp:

-rw-rw-r--    1 trinity  trinity   2183168 Dec 20 14:06 foobar.log
-rw-r--r--    1 trinity  trinity     14315 Dec 20 14:08 install.log.temp
-rw-rw-r--    1 trinity  trinity        43 Dec 20 14:08 sea_loc
-rw-rw-r--    1 trinity  trinity       778 Dec 20 14:08 temp.lax
-rw-r--r--    1 trinity  trinity      2437 Dec 20 14:09 jx.log

Look this stuff over, especially foobar.log, and see if there are any error
messages visible in the log which pinpoint the problem.  If you can't find 
anything, I'll compare it with my own install logs.

To send me the stuff, do the rest below:

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$ tar czf foobar.tgz foobar.log install.log.temp sea_loc temp.lax jx.log
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There are two big subdirectories under here I DO NOT want, that's why
I'm listing these files manually instead of using *.

Email me the foobar.tgz file and I'll compare it to my own.