With my new ubuntu 18.04 installation the machine is using my local WiFi LAN, and in most cases it is working fine. I can use a browser to the outside world, as well as email, and other internet services.

What I can not figure out or find an answer to is the connection that I had in 16.xx to the other machines on my network. I have this machine set up as an NFS server sharing an external drive for back ups. None of the other machines on the network can mount that share. Additionally, if I try to ping the 18.04 machine the ping just hangs and times out. If I try to ping any of the other machines on the network from the 18.04 machine the result is: Destination Host Unreachable.

I see:

Oct  9 09:41:20 XXXXmyServer kernel: [   21.519885] audit: type=1400 audit(1539092479.510:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=698 comm="apparmor_parser"

in my kern.log file.

What else should I check/report?

 sudo ufw status
Status: inactive

Also: sudo iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination       
  • Sounds like Ubuntu 18.04 has a firewall blocking the ping and NFS connection. Enter sudo ufw status and edit the question above and paste the output you get. – user68186 Oct 10 at 21:41
  • That's what I thought at first: Status: inactive – Larry Brown Oct 12 at 15:12

Are you using static IP addresses or DHCP ? Are you using any external firewall appliance? Post the contents of the Interfaces file for each machine. If you use Fail2ban, check for blocks. Look in your WiFi router logs for potential help. Why not connect the machines using Ethernet for simplification and reliability?

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