Problem with apt and nvidia 440 on ubuntu 20.04

I had that problem, too, and it’s solve by force overwrite the package by following command

sudo dpkg -i --force-overwrite /var/cache/apt/archives/libnvidia-compute-450_450.36.06-0ubuntu1_amd64.deb

After that, you can continue to fix other broken installs

sudo apt --fix-broken install

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