For anyone still confused by this, Vino used to have the handy configuration tool called 'vino-preferences' until about 2014, but that was removed when gnome-control-center became able to control it instead.

[ Discussion on that decision, here: https://forums.bunsenlabs.org/viewtopic.php?id=1411 ]

There are many distributions which can usefully use vino-server (which is an excellent VNC server), such as Lubuntu which I use - being based on LXDE, that doesn't use gnome-control-center and there's little reason to install such a big block of code just for one solitary function.

Instead, to access the vino-server configuration just install dconf-editor to control it:

sudo apt-get install dconf-editor

OR if you haven't installed vino yet, do both together:

sudo apt-get install vino dconf-editor

CONFIGURATION:

a. Open dconf-editor, then:

b. VNC settings can be accessed under org -> gnome -> desktop -> remote-access

Hope this helps someone.

SECURING VNC ACCESS over SSH

Let me just add here that for those wanting to pipe VNC through an SSH tunnel for secure remote access, you can use a command from the client end, in this form, to open the tunnel:

sudo ssh -g -L 0.0.0.0:5900:127.0.0.1:5900 your_username ip_of_your_remotemachine

This means "SSH, please open a tunnel to ip_of_your_remotemachine and make a TCP connection from it, out to 127.0.0.1:5900 (ie it's own port 5900 where vino-server is listening) -would you, and tunnel all traffic back to me / I'll mirror it out of :5900 locally - thanks".

SSH then does this;

You then open your VNC client (try the excellent Remmina) to your local address:port 127.0.0.1:5900 (which is mirroring the listening port at your remote server now) and VNC opens giving you remote desktop.

Read separately on turning off passwords for your SSH server and use keys only, for highest security.

Good luck all

GUI method

From: Change Critical Battery Level and Action in Linux Mint 18 Cinnamon you can install dconf-editor using:

$ sudo apt-get install dconf-editor

Then go to org -> cinnamon -> settings-daemon -> plugins -> power

• Default settings are (in %):
• Critical battery action: hibernate
• Critical: 2
• Action: 2
• Low: 10

Exercise caution and tweak to your heart’s content ?

Original Answer and edits below

Review your current settings with:

$ gsettings list-recursively | grep critical
org.gnome.settings-daemon.plugins.power critical-battery-action 'shutdown'
org.gnome.settings-daemon.plugins.power percentage-critical 3
org.gnome.settings-daemon.plugins.power time-critical 300

Change your critical-battery-action

$ gsettings set org.gnome.settings-daemon.plugins.power critical-battery-action 'suspend'

Linux Mate differences

When using Linux Mate you need to substitute org.gnome with org.mate and possibly change your keys. From ArchWiki:

Battery discharge

To disable the notification on battery discharge, run:

$ gsettings set org.mate.power-manager.notify-discharging false

However in Ubuntu there is no equivalent.

Find all Mate power settings

To find all Mate power settings use:

$ gsettings list-recursively | grep power-manager

In Ubuntu you would use:

$ gsettings list-recursively | grep plugins.power