Problème lancement matlab sous linux

Bonjour,
j'ai fraichement installé matlab 2009b sous linux (ubuntu 9.10), et lorsque je tente joyeusement de le lancer depuis un terminal j'ai la fâcheuse surprise de lire ce message d'erreur :

--------------------------------------------------
Warning: Cannot locate Java Runtime Environment (JRE) . . .

1. Either a correct JRE was not available for redistribution when
this release was shipped, in which case you should refer to the
Release Notes for additional information about how to get it.

2. Or you have tried to use the MATLAB_JAVA environment variable
to specify an alternate JRE, but MATLAB cannot find it. Please
run 'matlab -n' to determine what value you are using for
MATLAB_JAVA and fix accordingly.
---------------------------------------------------------------------------

matlab: No MATLAB executable for this machine architecture.

/home/mathieu/mnt/Matlab/bin/glnx86/MATLAB does not exist!


Qu'est-ce que je dois faire maintenant pour que ça marche ? J'ai cherché sur internet pour voir si des gens avaient eu des problèmes du même type mais je n'ai pas réussi à résoudre le problème, et ça devient urgent parce que j'en ai besoin pour travailler.

Pour info, lorsque je tape ''matlab -n'' comme on me dit de faire, il s'affiche ceci

------------------------------------------------------------------------
-> (.matlab7rc.sh) sourced from directory (DIR = $MATLAB/bin)
-> DIR = /home/mathieu/mnt/Matlab/bin
------------------------------------------------------------------------
a = argument e = environment r = rcfile s = script
------------------------------------------------------------------------
-> r MATLAB = /home/mathieu/mnt/Matlab
-> LM_LICENSE_FILE = (variable not defined)
-> MLM_LICENSE_FILE = (variable not defined)
-> s AUTOMOUNT_MAP =
-> e DISPLAY = :0.0
-> r ARCH = glnx86
-> s TOOLBOX = /home/mathieu/mnt/Matlab/toolbox
-> r XAPPLRESDIR = /home/mathieu/mnt/Matlab/X11/app-defaults
-> r XKEYSYMDB = /home/mathieu/mnt/Matlab/X11/app-defaults/XKeysymD
B
-> e MAX_OPEN_FILES = 1024
-> s _JVM_THREADS_TYPE =
-> e MATLAB_JAVA =
-> s MATLAB_MEM_MGR =
-> s MATLAB_DEBUG =
-> s LD_LIBRARY_PATH = /home/mathieu/mnt/Matlab/sys/os/glnx86:/home/mathi
eu/mnt/Matlab/bin/glnx86:/home/mathieu/mnt/Matlab/extern/lib/glnx86:/lib/i386/na
tive_threads:/lib/i386
-> a arglist =
-> e SHELL = /bin/bash
-> e PATH = /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/opt/real/RealPlayer:/home/mathieu/mnt/Matlab/bin:/home/mathieu/mnt/Matlab/
java

---------------------------------------------------------------------------
Warning: Cannot locate Java Runtime Environment (JRE) . . .

1. Either a correct JRE was not available for redistribution when
this release was shipped, in which case you should refer to the
Release Notes for additional information about how to get it.

2. Or you have tried to use the MATLAB_JAVA environment variable
to specify an alternate JRE, but MATLAB cannot find it. Check
the value of MATLAB_JAVA above and fix accordingly.
---------------------------------------------------------------------------

-> s MATLABPATH = (initial version)
/home/mathieu/mnt/Matlab/toolbox/local


-> $MATLAB/toolbox/local/pathdef.m -




merci de votre aide :-)