When using PCMANFM in Lubuntu, I like to have the ability to select multiple items via keyboard shortcuts. By default in Lubuntu 14.04 LTS the keyboard shortcut ctrl space should select multiple items but there is a shortcut conflict that is easy to fix.
To fix this issue, go to
Menu -> Preferences -> Keyboard Input Methods
So what we are going to change is the “Ibus Preferences” which is responsible for switching different keyboard layouts. I’m not interested in having more than one, so change the option that says “Next input option” to
some other keybinding you’re not going to use, I chose shift space. I also de-selected the tray icon to minimize space too.