scilab installation crashed when internet connection was interrupted and could not be installed after trying again

a program with a ? in the launcher named Terminal
reports this:
There was an error creating the child process for this terminal
Failed to execute child process "scilab-adv-cli" (No such file or directory)
with the options of:

Profile Preferences
Relaunch
the relaunch option does nothing

Currently using ubuntu 12.04 LTS
and tryed to use scilab 5.3.3-6 with the next add-ons:
-GNU fortran 95 compiler
-Scilab module for artificial neural networks
-Matlab -like plotting library for scilab
-Symbolic computations for scilab based on maxima
-Scilab wavelet and signal processing toolbox

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: scilab (not installed)
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Tue May 22 20:13:00 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: scilab
UpgradeStatus: No upgrade log present (probably fresh install)