Possibly related to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1971955 which AFAIU the root cause was identified as the SystemCallFilter blocking unshare() syscall.
Possibly related to https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1971955 which AFAIU the root cause was identified as the SystemCallFilter blocking unshare() syscall.