i have recently installed a ubuntu 18.04 on my pc. at the time of installation the monitor was different and now i have changed the monitor. initially the system and monitor was working fine but after i changed the monitor, the display started flickering. the intensity of flicker is high upon the start of pc and reduces gradually and after around 30 minutes of pc being used, the flicker gets reduced. also sometimes the app windows goes black, the main desktop page still works. i am very new to ubuntu as well as computers.please help.
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