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

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