I've been playing around with Peppermint OS and found an issue with the LibreOffice file dialogs.
The LibreOffice File > Open, File > Save dialogs don't include useful things like mounted USB memory sticks, network links or any bookmarks that you would find in the system file manager.
You get the same dreadful dialogs in Lubuntu if you set the "Use LibreOffice dialogue boxes" option in LibreOffice.
