This can be done in two different ways, depending on whether access is from the keyboard or via the menu.
From the keyboard:
One has to edit
note: it's always a good thing to save a copy of
Use a text editor to open
~/.config/openbox/lubuntu-rc.xml. This file has several sections; in the section devoted to keybindings, add this:
Save the file and exit the text editor. Open a terminal and run
openbox --reconfigure to refresh lubuntu-rc.xml. After this, any time you access lxterminal from the keyboard using Ctrl+Alt+T, lxterminal will open with a size of 140 columns by 40 rows.
From the menu:
This requires editing of a
.desktop file. By default, .desktop files are located in
/usr/share/applications and could be edited there (using
However, it may be preferable to make a copy of the .desktop file in
~/.local/share/applications because editing this file only affects the specific user (and doesn't need
~/.local/share/applications. Then open the copied file with a text editor. Search for a line that starts with
Exec= and change
Exec=lxterminal --geometry=140x40. Save the file. Done.