I believe that this bug for 21.04 is the same as https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1924685 and the root cause is the misconfiguration of kernel flags.
I believe that this bug for 21.04 is the same as https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1924685 and the root cause is the misconfiguration of kernel flags.