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I upgraded a bunch of old machines from Xubuntu 18.04 to 20.04, everything going smooth except a distressing flickering when windows go on focus or scroll (i can briefly see other windows that are in the background) I think it's a graphic driver issue but i'm unable to switch from nouveau drivers to proprietary nvidia ones, because Software & Updates -> Additional Drivers shows no output. Even the command

ubuntu-drivers devices

gives no output Is there anybody experimenting the same problems or able to help me? Thanks, Lorenzo

lspci | grep VGA gives: VGA 00:12.0 VGA compatible controller: NVIDIA Corporation C68 [GeForce 7025 / nForce 630a] (rev a2)

2 Answers2

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You need to black list your nouveau driver when your linux boots up cause of some dependency problems nouveau drivers are not best suited for some graphics card. After successfully booting up you had to switch from opensource driver that was that nouveau driver to proprietary driver by nvidia .

Please follow this link for how to blacklist that driver What does modprobe.blacklist=nouveau do?

David DE
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Have you tried updating the whole pc after updating Ubuntu version using: sudo apt update && sudo apt upgrade