how to rebuilt simulink toolbox. Problem occure to save figures.

Hi everyone.

I've accidently remove the Simulink toolbox from the following path "/Matlab/2019a/toolbox/simulink/simulink". The consequence is that I can't use anymore the functions "saveas" or "print" to save my figures. The following messages appeared.

>> saveas(figure,'wavelet_analisys.png')

Previously accessible file "/home/t00712/Matlab/2019a/toolbox/simulink/simulink/is_simulink_loaded.m" is now inaccessible.

Error in isslhandle (line 12)

if ~(isSimulinkPresent && is_simulink_loaded)

Error in isSLorSF (line 24)

if(all(isslhandle(handles)))

Error in useOriginalHGPrinting

Error in printjob (line 19)

if useOriginalHGPrinting(varargin{:})

Error in saveas (line 159)

[ops,dev,ext] = printtables(printjob(h)); %#ok

>> print(figure,'-dpng')

Previously accessible file "/home/t00712/Matlab/2019a/toolbox/simulink/simulink/is_simulink_loaded.m" is now inaccessible.

Error in isslhandle (line 12)

if ~(isSimulinkPresent && is_simulink_loaded)

Error in isSLorSF (line 24)

if(all(isslhandle(handles)))

Error in useOriginalHGPrinting

Error in printjob (line 19)

if useOriginalHGPrinting(varargin{:})

Error in print>LocalCreatePrintJob (line 101)

pj = printjob([handles{:}]);

Error in print (line 38)

[pj, inputargs] = LocalCreatePrintJob(varargin{:});

So, I think that I have to rebuild the simulink toolbox but I don't know how. Any help could be welcolme.

I'm working on "Ubuntu 18.04.2 LTS" and using the "9.6.0.1114505 (R2019a) Update 2" version of Matlab.

Thanks everyone.

cheers