ufwでiptables: Operation not supported エラーが発生する

Question

#環境
OS: Raspbian Buster Lite (10.4)
#コードと実行結果
###sudo ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
ERROR: problem running ufw-init
iptables-restore: line 6 failed
iptables-restore: line 22 failed
iptables-restore v1.8.2 (nf_tables): Couldn't load match `conntrack':No such file or directory

Error occurred at line: 2
Try iptables-restore -h' or 'iptables-restore --help' for more information. iptables-restore: line 4 failed iptables-restore: line 5 failed iptables-restore: line 21 failed iptables-restore v1.8.2 (nf_tables): unknown option "--dport" Error occurred at line: 19 Try iptables-restore -h' or 'iptables-restore --help' for more information.
iptables-restore: line 10 failed
iptables-restore v1.8.2 (nf_tables): unknown option "--dport"
Error occurred at line: 21
Try `iptables-restore -h' or 'iptables-restore --help' for more information.
iptables-restore v1.8.2 (nf_tables): Chain 'ufw-before-input' does not exist

Problem running '/etc/ufw/before.rules'
Problem running '/etc/ufw/after.rules'
Problem running '/etc/ufw/user.rules'

###sudo iptables-restore -h
Usage: xtables-restore [-c] [-v] [-V] [-t] [-h] [-n] [-T table] [-M command] [-4] [-6]
[ --counters ]
[ --verbose ]
[ --version]
[ --test ]
[ --help ]
[ --noflush ]
[ --table=<TABLE> ]
[ --modprobe=<command> ]
[ --ipv4 ]
[ --ipv6 ]

###sudo ufw allow 22
WARN: initcaps
[Errno 2] iptables: Operation not supported.

Skipping adding existing rule
###sudo ufw status
Status: inactive

#補足
コードをこの順で回して結局ufwをアクティブにすることができませんでした。Skipping adding existing rule　と出てますが、これは自分が何度も試しているからかなと思います。ただ、何度ufw statusを打ってもactiveと表示されることはありませんでした。

Answer 1

OSをUbuntuに差し替えて同様の操作をしたところ正常に動作しました