Ubuntu 20.04 has two kernel versions available, the GA kernel 5.4 and the HWE kernel 5.11. You need the HWE kernel. Please check your current kernel version
cat /proc/version
and change to the HWE kernel, if necessary
https://wiki.ubuntu.com/Kernel/LTSEnablementStack
If that doesn’t help, please create a new nvidia-bug-report.log.
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