Same problem here, initiated by a "quick" apt upgrade.
Seems to be equal a repeat of #1910709
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https://bugs.launchpad.net/bugs/1938930
Title:
nvidia-340 340.108-0ubuntu5.20.04.2:
Works (including WIFI and suspend).
** Attachment added: "out of dpkg -i"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-340/+bug/1910709/+attachment/5453085/+files/install.txt
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Lenovo T510 on Ubuntu 20.04.1 LTS, dpkg and lspci output.
** Attachment added: "dpkg and lspci output"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-340/+bug/1910709/+attachment/5452726/+files/dpkg_lspci.txt
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Same here. After an update yesterday, my Lenovo T510 stopped working.
Boot to a eternal blinking cursor, no gfx mode. Uninstall the nvidia-340
switched to nouveau and gave the GUI back.
Nouveau works quite well, **UNFORTUNATELY** it does not support suspend mode,
which is a "must" on a laptop.
