Open References → Monitor stettings for a first information. Open a terminal:
Show name / chip set: lspci -nnk | grep -i VGA -A2
(Enter)
driver version
Show driver name and release version:glxinfo | grep 'OpenGL version string'
(Enter)
graphic mode (resolution)
Show the resolution set and all possible screen resolutions and the interfaces:xrandr
(Enter)
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install Skype
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broken packages, interrupted installation, Update to new Lubuntu release