I am finding on a 2008 MacPro with GTX680 that the installation of the nvidia-340 package under Ubuntu 20.04 prevents single user mode boots from working. While the nvidia-340 driver works fine from a normal boot, when 'single' is added before 'quiet' in the grub kernel arguments, the boot produces a black screen that never returns the expected single user mode prompts. A parallel test with current Ubuntu 18.04 with either the stock nvidia-340 340.107-0ubuntu0.18.04.4 package or the nvidia-graphics-drivers-340 340.108-0ubuntu0.18.04.1 show both of them can successfully boot into single user mode. Jack
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