Public bug reported:

On booting ubuntu20.04, I keep getting this Warning:

machine.slice: unit configures an IP firewall, but the local system does not 
support BPF/cgroup firewalling.
(This warning is only shown for the first unit using IP firewalling.)

How do I fix it?

> cat /etc/os-release 
NAME="Ubuntu"
VERSION="20.04 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

from boot logs:
systemd 245.4-4ubuntu3 running in system mode. (+PAM +AUDIT +SELINUX +IMA 
+APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 
+SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=hybrid)
Detected virtualization lxc-libvirt.
Detected architecture x86-64.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1879262

Title:
  Getting  "BPF/cgroup firewalling" warning on booting Ubuntu20.04

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