First a small warning: You seem to be using the 'oibaf' graphics PPA
which is not supported and is known to cause bugs. However I think it's
unlikely that's relevant here.
Second, other people are already reporting that having the Nvidia driver
installed has broken their brightness control. See bug 1861532 and bug
1857764.
Please try uninstalling the Nvidia driver, and try uninstalling that
PPA.
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1862835
Title:
Unable to change laptop screen brightness or keyboard backlighting
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