/usr/share/lxc/config/common.seccomp is in liblxc-common 3.0.1-0ubuntu1~18.04.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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blacklist
reject_force_umount # comment this to allow umount -f; not recommended
[all]
kexec_load errno 1
open_by_handle_at errno 1
init_module errno 1
finit_module errno 1
delete_module errno 1
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