How to Install Light on Ubuntu 18.04 Bionic LTS
Getting Started
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4. Testing Light
Finally, to Test Light
From Shell simply with:light -G
In the Output you should see the current Screen’s Enlightenment in percentage value.
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5. Light Getting Started Guide
Getting Started with Light for Ubuntu GNU/Linux

So Now I’m truly Happy if My Guide could Help you to Quick Start with Light on Ubuntu 18.04 Bionic!