I am getting this failure at boot.  Can I uninstall netfilter-persistent or is it required?

 

sudo systemctl status netfilter-persistent
● netfilter-persistent.service - netfilter persistent configuration
   Loaded: loaded (/lib/systemd/system/netfilter-persistent.service; enabled; ve
   Active: failed (Result: exit-code) since Sat 2021-04-17 07:26:49 PDT; 1h 16mi
  Process: 469 ExecStart=/usr/sbin/netfilter-persistent start (code=exited, stat
 Main PID: 469 (code=exited, status=1/FAILURE)

Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: line 3: CHAIN_UPDATE fail
Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: line 4: CHAIN_UPDATE fail
Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: line 5: CHAIN_UPDATE fail
Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: run-parts: /usr/share/net
Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: run-parts: executing /usr
Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: ip6tables-restore v1.8.2 
Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: line 3: CHAIN_UPDATE fail
Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: line 4: CHAIN_UPDATE fail
Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: line 5: CHAIN_UPDATE fail
Apr 17 07:26:51 tinkerboard netfilter-persistent[469]: run-parts: /usr/share/net
lines 1-16/16 (END)

 

 

 

I think this is where the failed lines 3, 4, and five.  Maybe because of the netfilter failure.

 

/etc/iptables/iptables rules.v6

# Generated by xtables-save v1.8.2 on Sat Apr 17 07:24:31 2021
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT
# Completed on Sat Apr 17 07:24:31 2021

 

 

sudo iptables-restore < /etc/iptables/rules.v6
iptables-restore v1.8.2 (nf_tables): 
line 3: CHAIN_UPDATE failed (No such file or directory): chain INPUT
line 4: CHAIN_UPDATE failed (No such file or directory): chain FORWARD
line 5: CHAIN_UPDATE failed (No such file or directory): chain OUTPUT
 

 

 

you can try uninstalling.  FYI iptables is a wrapper for nftables in modern kernels.

I uninstalled netfilter-persistent.  It also uninstalled iptables-persistent.

I think it is rules for the firewall. But there is no rules in it.