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Energia installation in ubuntu18.04

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Dear Community,

I tried installing energia (Binary release version 1.8.7E21) for Linux 64-bit.

Followed the steps given at http://energia.nu/guide/install/linux 

when i execute ./energia & i get the following messages and the application doesn't open. Kindly help me resolve this issue. Thank you

java.lang.Error: Cannot load com.sun.java.swing.plaf.gtk.GTKLookAndFeel
    at javax.swing.UIManager.initializeDefaultLAF(UIManager.java:1351)
    at javax.swing.UIManager.initialize(UIManager.java:1459)
    at javax.swing.UIManager.maybeInitialize(UIManager.java:1426)
    at javax.swing.UIManager.getLookAndFeel(UIManager.java:492)
    at processing.app.linux.GTKLookAndFeelFixer.installGtkPopupBugWorkaround(GTKLookAndFeelFixer.java:79)
    at processing.app.linux.Platform.setLookAndFeel(Platform.java:40)
    at processing.app.Base.guardedMain(Base.java:214)
    at processing.app.Base.main(Base.java:136)


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