After installing ubuntu 18 I installed and uninstalled many desktop environments, ending up to Unity which I like the most. However the only problem is that whenever I use the function keys to decrease volume or brightness they have an unacceptable response time of about ~1-2 minutes (so brightness or volume in/decreases only 1-2 min after I press them). The other function keys for disabling touch pad or keyboard backlight work instantly. What can be the issues?

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