Thanks.
boot-3.txt shows nvidia-340 failed because:
Feb 26 12:56:58 ubuntu-P55A-UD3 /usr/lib/gdm3/gdm-x-session[1685]: (EE)
NVIDIA(GPU-0): Failed to initialize DMA.
boot-4.txt shows the nvidia-340 kernel driver crashing.
boot-5.txt shows nvidia-390 failed because:
Feb 26 12:41:43 ubuntu-P55A-U
2 of 5
** Attachment added: "boot-2.txt"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1864781/+attachment/5331177/+files/boot-2.txt
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1st attachment of 5(1 of 5)
** Attachment added: "boot-1.txt"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1864781/+attachment/5331176/+files/boot-1.txt
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4 of 5
** Attachment added: "boot-4.txt"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1864781/+attachment/5331179/+files/boot-4.txt
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5 of 5
** Attachment added: "boot-5.txt"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1864781/+attachment/5331180/+files/boot-5.txt
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3 of 5
** Attachment added: "boot-3.txt"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1864781/+attachment/5331178/+files/boot-3.txt
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