Brigthness control doesn’t work on Ubuntu 20.04

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Hope everyone is doing fine. I’ve recently upgraded my laptop, Ubuntu 14.04 LTS to Ubuntu 20.04 LTS. I’ve installed Unity Desktop and have realized that the brightness control (System settings – Brightness & Lock) is not working. When I try to change the brightness using the bar, nothing changes.
Would anyone know how to solve it? Thanks in advance,
Jacqueline

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