Ubuntu – going to be the future for Lubuntu (LXQt or LXDE)

Right...

Well thanks to all support I found the solution in the end for lubuntu LXQt 18.10
Finally I got rid of my laptop shutting down instead of suspending after pushing the power button...

I realize a power button logically should switch off power, but since the last 15 of years or so, people are used to have their laptops suspending by pushing it.

For others that have the same annoying thing and getting no answer for this simple question try this:

open terminal and run this command:

sudo apt install gnome-settings-daemon
gsettings set org.gnome.settings-daemon.plugins.power power-button-action suspend

and than install a text editor like gedit, and edit a file:

sudo apt install gedit -y;
sudo gedit /etc/systemd/logind.conf;

and paste these lines at the end of the file:

HandlePowerKey=suspend
PowerKeyIgnoreInhibited=yes

and use keys Ctrl+S to save it.

• Restart your laptop.

The power button should suspend your laptop now.

Edit dated 20200526: thanks to this question, I realized that another solution would be to change the shortcut for showing/hiding the LXQt menu to something like Meta+Space. In other words, if one sets Meta+Space to show/hide LXQt's menu, the "pure" Super is available for use in ~/.config/openbox/lxqt-rc.xml. No need to use the combination of C+W detailed below. Your 18.04 lubuntu-rc.xml will work now in Lubuntu 20.04 (and 19.10).

This answer is applicable to Lubuntu 19.10 and Lubuntu 20.04

And, for clarity, the file used in the Lubuntu session should be ~/.config/openbox/lxqt-rc.xml and that in a pure Openbox session should be named ~/.config/openbox/rc.xml

In How to snap windows?, a member of the Lubuntu team suggests including some code in lxqt-rc.xml to bring back window tiling and also addresses the conflict I mentioned in the question:

... in 19.04+, you’ll run into conflicts with lxqt-globalkeys using the key to open the menu, so either disable that, reconfigure that, or use something other than the Windows key here.

Please look at the keyboard shortcuts section in the manual for Lubuntu 20.04 which has the list of default keyboard shortcuts but also mentions this:

Global-keys will take preference over openbox bindings. If a key is used in Global-keys, it will not work in Openbox keyboard shortcuts. For example if the W(indows) key opens the LXQT application menu (equivilant of the windows start menu) in Global-keys, Openbox commands like window resizing (W + arrow keys) will not work correctly. Keep this in mind when using and editing keyboard shortcuts.

If one wants the same tiling shortcuts that were used in Lubuntu 19.04, here they are in a somewhat modified form. I've included using the Control key together with the Super key and the relevant arrow key instead of just the Super key and the relevant arrow key.

One important point with the keyboard shortcuts listed below is that the user must first press and hold the Ctrl key and then press and hold the Super key and then press the relevant arrow key before releasing all the keys. If the user first presses the Super key first, and then presses the Ctrl key, the shortcuts will not work.

    <!--
        Lubuntu specific.
        Keybindings for window tiling
    -->
    <!--
        # HalfLeftScreen
    -->
  <keybind key="C-W-Left">
    <action name="UnmaximizeFull"/>
    <action name="MoveResizeTo">
      <x>0</x>
      <y>0</y>
      <height>100%</height>
      <width>50%</width>
    </action>
  </keybind>
    <!--
        # HalfRightScreen
    -->
  <keybind key="C-W-Right">
    <action name="UnmaximizeFull"/>
    <action name="MoveResizeTo">
      <x>-0</x>
      <y>0</y>
      <height>100%</height>
      <width>50%</width>
    </action>
  </keybind>
    <!--
        # HalfUpperScreen
    -->
  <keybind key="C-W-Up">
    <action name="UnmaximizeFull"/>
    <action name="MoveResizeTo">
      <x>0</x>
      <y>0</y>
      <width>100%</width>
      <height>50%</height>
    </action>
  </keybind>
    <!--
        # HalfLowerScreen
    -->
  <keybind key="C-W-Down">
    <action name="UnmaximizeFull"/>
    <action name="MoveResizeTo">
      <x>0</x>
      <y>-0</y>
      <width>100%</width>
      <height>50%</height>
    </action>
  </keybind>

After the edits, open a terminal and run openbox --reconfigure for the keybinding to take effect. Alternatively, log out and log back in.

I didn't include keyboard shortcuts for maximizing or minimizing windows because these actions and many others can easily be accessed by pressing Alt+Spacebar. Note that Openbox prefers to use iconify instead of minimize.