eclipse startup error on Ubuntu 18.04

I just installed the Eclipse IDE, but there seems to be an error when I execute Eclipse.exe.

Here's the log file:

!SESSION Wed Nov 28 18:42:12 IST 2018 ------------------------------------------
!ENTRY org.eclipse.equinox.launcher 4 0 2018-11-28 18:42:12.757
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.ClassNotFoundException: org.eclipse.core.runtime.adaptor.EclipseStarter at (URLClassLoader.java:466) at (ClassLoader.java:566) at (ClassLoader.java:499) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:626) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584) at org.eclipse.equinox.launcher.Main.run(Main.java:1438) at org.eclipse.equinox.launcher.Main.main(Main.java:1414)

what should I do?

Know someone who can answer? Share a link to this question via email, Twitter, or Facebook.