Toshiba Satellite C50-B, Lubuntu 18.04.
Since 18.04, when the laptop is booting there are light blue lines at the top and bottom of the screen, about 4 pixels thick. When running with application maximized, the small gap is still there.
xrandr is so complicated I can't understand it.
lxrandr only says what its got: eDP-1: 1366x768 60 fps
arandr doesn't say how to use it.
How can I make the "desktop area" fill the physical screen?
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