How can i fix broken and incomplete documentation on MATLAB2018b on ubuntu 18.04.

I've installed MATLAB 2018b on ubuntu 16.04 and then upgraded ubuntu to 18.04. Now, I found the documentation broken and incomplete.

For eg,if i search ecg, the command window shows the following and documentation doesnt show anything

Exception in thread "AWT-EventQueue-0": java.lang.NullPointerException
	at com.mathworks.help.helpui.DocRoot.buildDocPageUrl(DocRoot.java:44)
	at com.mathworks.help.helpui.DocPageUrlBuilder.buildDocPageUrl(DocPageUrlBuilder.java:25)
	at com.mathworks.help.helpui.DocPageUrlBuilder.buildFileUrl(DocPageUrlBuilder.java:21)
	at com.mathworks.mlwidgets.help.LightweightHelpPanel$JsHelpPanelClientRunnable.getUrlToLoad(LightweightHelpPanel.java:224)
	at com.mathworks.mlwidgets.help.LightweightHelpPanel$JsHelpPanelClientRunnable.run(LightweightHelpPanel.java:208)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:

Documentation help is not formatted. I am attaching the screenshot

[Nicolas GROLLIER]

Hello, I have the exact same problem with the same OS configuration :(.

However, I'm not sure to have the package for the "ecg" function. If I search for "ifft", I have the function description but the documentation is still not formatted.

I'm also interested for an answer even if this is not a major problem.

[Shirshendhu Panday 16BEE0129]

I am also getting same problems and screenshots in Windows after the update.

[b z]

same problem for me