I\'ve just installed Ubuntu 16.04 LTS. I downloaded a fresh Eclipse on March 2 for Linux 64-bit.
I am using the latest Oracle hotspot JDK 1.8 update 91 release.
The issue is the updated GTK version.
The following post solves the problem: https://askubuntu.com/questions/761604/eclipse-not-working-in-16-04
Setting the following into eclipse.ini
--launcher.GTK_version 2
As explained in the ubuntu Q&A.