How can I suspend using a keyboard shortcut, without administrator privileges?

For Ubuntu 15.04. and later you can use from the terminal

systemctl suspend

Then create a shortcut in the settings/keyboard app with the same command.

key-sortcut

Easy!

Reason: Ubuntu switched from upstart to systemd.

Install the powermanagement-interface package first, it provides the pmi command we will use to suspend.
UPDATE: I looked at the source for pmi and the command it uses to suspend is:
```
dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Suspend
```
If you can't install pmi, replace pmi action suspend with that command in the next step.
Open up System -> Preferences -> Keyboard Shortcuts, click on Add and put pmi action suspend as the command.
Click on the newly created shortcut entry, and set the shortcut keys.

Same as above, but use this command instead:

dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 "org.freedesktop.login1.Manager.Suspend" boolean:true

Source: http://forum.ubuntu-fr.org/viewtopic.php?pid=16497311#p16497311

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