Linux 64 bits and Pharo Launcher

Hello and thanks for your help,

No difficulties to launch Pharo 6.1 when I use the following package :
https://files.pharo.org/platform/Pharo6.1-64-linux.zip

but when I try to use Pharo Laucher :
http://files.pharo.org/pharo-launcher/1.1/PharoLauncher-linux-1.1-x64.zip
on my laptop (Linux 64 bits) the following error message occurs :

http://ramix.org/roassal/error-message.png

Details concerning my Linux distribution :
  DISTRIB_DESCRIPTION="Ubuntu 18.04 LTS"
  VERSION="18.04 LTS (Bionic Beaver)"

--
All the best.
Rene Paul Mages ( GnuPG_key 0x9840A6F7 )
http://renemages.wordpress.com/smalltalk/pharo/
http://blog.pharo.fr