~ » ssh root@192.168.5.152                                  play_pc@Play-PC-PC6
root@192.168.5.152's password: 
 _____ _       _             _                         _ 
|_   _(_)_ __ | | _____ _ __| |__   ___   __ _ _ __ __| |
  | | | | '_ \| |/ / _ \ '__| '_ \ / _ \ / _` | '__/ _` |
  | | | | | | |   <  __/ |  | |_) | (_) | (_| | | | (_| |
  |_| |_|_| |_|_|\_\___|_|  |_.__/ \___/ \__,_|_|  \__,_|
                                                         

Welcome to ARMBIAN 5.32 user-built Ubuntu 16.04.3 LTS 4.13.2-rockchip   
System load:   0.10 0.08 0.07  	Up time:       14 min		
Memory usage:  2 % of 2006MB 	IP:            192.168.5.152
Usage of /:    4% of 29G    	

Last login: Fri Sep 15 09:11:57 2017 from 192.168.5.37

root@tinkerboard:~# ufw enable; ufw disable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
ERROR: problem running ufw-init
modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.13.2-rockchip/modules.dep.bin'
modprobe: FATAL: Module nf_conntrack_ftp not found in directory /lib/modules/4.13.2-rockchip
modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.13.2-rockchip/modules.dep.bin'
modprobe: FATAL: Module nf_nat_ftp not found in directory /lib/modules/4.13.2-rockchip
modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.13.2-rockchip/modules.dep.bin'
modprobe: FATAL: Module nf_conntrack_netbios_ns not found in directory /lib/modules/4.13.2-rockchip
iptables-restore: line 77 failed
iptables-restore: line 11 failed
ip6tables-restore: line 138 failed

Problem running '/etc/ufw/before.rules'
Problem running '/etc/ufw/user.rules'
Problem running '/etc/ufw/before6.rules'

Firewall stopped and disabled on system startup
root@tinkerboard:~# 










 _____ _       _             _                         _ 
|_   _(_)_ __ | | _____ _ __| |__   ___   __ _ _ __ __| |
  | | | | '_ \| |/ / _ \ '__| '_ \ / _ \ / _` | '__/ _` |
  | | | | | | |   <  __/ |  | |_) | (_) | (_| | | | (_| |
  |_| |_|_| |_|_|\_\___|_|  |_.__/ \___/ \__,_|_|  \__,_|
                                                         

Welcome to ARMBIAN 5.32 user-built Ubuntu 16.04.3 LTS 4.11.6-rockchip   
System load:   0.31 0.10 0.03  	Up time:       1 min		
Memory usage:  1 % of 2007MB 	IP:            192.168.5.54
CPU temp:      52°C           	
Usage of /:    4% of 29G    	

[ General system configuration: armbian-config ]

Last login: Fri Sep 15 09:49:20 2017 from 192.168.5.37

root@tinkerboard:~# ufw status
Status: inactive
root@tinkerboard:~# ufw enable; ufw disable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
ERROR: problem running ufw-init
modprobe: FATAL: Module nf_conntrack_ftp not found in directory /lib/modules/4.11.6-rockchip
modprobe: FATAL: Module nf_nat_ftp not found in directory /lib/modules/4.11.6-rockchip
modprobe: FATAL: Module nf_conntrack_netbios_ns not found in directory /lib/modules/4.11.6-rockchip
iptables-restore: line 77 failed
iptables-restore: line 11 failed
ip6tables-restore: line 138 failed

Problem running '/etc/ufw/before.rules'
Problem running '/etc/ufw/user.rules'
Problem running '/etc/ufw/before6.rules'

Firewall stopped and disabled on system startup
root@tinkerboard:~#