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This question already has an answer here:

I there any keyboard shortcut of suspending the system like we have ALT+CTRL+L for locking.

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marked as duplicate by BuZZ-dEE, Wilf, Avinash Raj, karel, souravc Mar 2 '14 at 17:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Many people had the same question before. Here is the answer to your question. It explains step by step on how to create the shortcut.

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This works better as the command: dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 "org.freedesktop.login1.Manager.Suspend" boolean:true – Chrisky Oct 28 '14 at 23:11
The answer you point at is outdated and no longer valid for 14.04 – Marc Dec 3 '15 at 17:58

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