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sudo apt-get install xrandrReading package lists... DoneBuilding dependency tree Reading state information... DonePackage xrandr is not available, but is referred to by another package.This may mean that the package is missing, has been obsoleted, oris only available from another sourceHowever the following packages replace it: x11-xserver-utilsE: Package 'xrandr' has no installation candidate
man xrandr