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Ubuntu 18.04, Lost control of brightness after grub crashes

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I updated ubuntu version 16.04 to 18.04 on my Dell Vostro-3478 almost a year ago. Last few days, the screen was freezing again and again and i had to restart it each time. The grub crashed yesterday when i tried to connect the wifi. Somehow managed to log into system using rescue mode. But now, neither the F key(for brightness) nor the brightness control in system settings is working.

Although i am able to increase brightness using sudo through /sys/class/backlight/intel_backlight/brightness. Please help. I am a newbie here and having my placements very soon!

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