I'm having a similar problem.
My machine won't resolve local LAN hostnames, but works otherwise.
The hostname in question is U35WF. It's at 192.168.1.101
My home router is at 192.168.1.2. It's name is E3000 and I can't access it via hostname either. If I ssh into it via its ip address it correctly resolves U35WF to 192.168.1.101.
Here are my results for the commands you asked to run, plus a couple others.
If you can tell me how to fix this, great. If you can explain how you knew what to fix, better yet.Code:alan at P100 in ~ $ apt policy netplan netplan: Installed: (none) Candidate: 1.10.1-5build1 Version table: 1.10.1-5build1 500 500 http://archive.ubuntu.com/ubuntu bionic/universe i386 Packages alan at P100 in ~ $ apt policy netplan.io netplan.io: Installed: 0.36.1 Candidate: 0.36.1 Version table: *** 0.36.1 500 500 http://archive.ubuntu.com/ubuntu bionic/main i386 Packages 100 /var/lib/dpkg/status alan at P100 in ~ $ ip address 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000 link/ether 00:16:36:de:17:0e brd ff:ff:ff:ff:ff:ff 3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:19:d2:3a:65:06 brd ff:ff:ff:ff:ff:ff inet 192.168.1.99/24 brd 192.168.1.255 scope global dynamic noprefixroute wlan0 valid_lft 82163sec preferred_lft 82163sec inet6 fe80::abce:be2d:e90:60c6/64 scope link noprefixroute valid_lft forever preferred_lft forever 4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000 link/ether 52:54:00:67:01:5e brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever 5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000 link/ether 52:54:00:67:01:5e brd ff:ff:ff:ff:ff:ff alan at P100 in ~ $ ip route default via 192.168.1.2 dev wlan0 proto dhcp metric 600 169.254.0.0/16 dev virbr0 scope link metric 1000 linkdown 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.99 metric 600 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown alan at P100 in ~ $ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback alan at P100 in ~ $ cat /etc/resolv.conf # This file is managed by man:systemd-resolved(8). Do not edit. # # This is a dynamic resolv.conf file for connecting local clients to the # internal DNS stub resolver of systemd-resolved. This file lists all # configured search domains. # # Run "systemd-resolve --status" to see details about the uplink DNS servers # currently in use. # # Third party programs must not access this file directly, but only through the # symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way, # replace this symlink by a static file or a different symlink. # # See man:systemd-resolved.service(8) for details about the supported modes of # operation for /etc/resolv.conf. nameserver 127.0.0.53 alan at P100 in ~ $ cat /etc/nsswitch.conf # /etc/nsswitch.conf # # Example configuration of GNU Name Service Switch functionality. # If you have the `glibc-doc-reference' and `info' packages installed, try: # `info libc "Name Service Switch"' for information about this file. passwd: compat systemd group: compat systemd shadow: compat gshadow: files hosts: files mdns4_minimal [NOTFOUND=return] wins dns networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis alan at P100 in ~ $ nslookup ubuntu.com Server: 127.0.0.53 Address: 127.0.0.53#53 Non-authoritative answer: Name: ubuntu.com Address: 91.189.94.40 alan at P100 in ~ $ nslookup U35WF Server: 127.0.0.53 Address: 127.0.0.53#53 ** server can't find U35WF: SERVFAIL alan at P100 in ~ $ dig ubuntuforums.com ; <<>> DiG 9.11.3-1ubuntu1-Ubuntu <<>> ubuntuforums.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6265 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 65494 ;; QUESTION SECTION: ;ubuntuforums.com. IN A ;; ANSWER SECTION: ubuntuforums.com. 600 IN A 91.189.94.12 ubuntuforums.com. 600 IN A 91.189.94.16 ;; Query time: 138 msec ;; SERVER: 127.0.0.53#53(127.0.0.53) ;; WHEN: Wed May 30 00:05:26 EDT 2018 ;; MSG SIZE rcvd: 77 alan at P100 in ~ $ dig U35WF ; <<>> DiG 9.11.3-1ubuntu1-Ubuntu <<>> U35WF ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 10085 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 65494 ;; QUESTION SECTION: ;U35WF. IN A ;; Query time: 0 msec ;; SERVER: 127.0.0.53#53(127.0.0.53) ;; WHEN: Wed May 30 00:05:32 EDT 2018 ;; MSG SIZE rcvd: 34 alan at P100 in ~ $ dig U35WF @192.168.1.2 ; <<>> DiG 9.11.3-1ubuntu1-Ubuntu <<>> U35WF @192.168.1.2 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21027 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;U35WF. IN A ;; ANSWER SECTION: U35WF. 0 IN A 192.168.1.101 ;; Query time: 2 msec ;; SERVER: 192.168.1.2#53(192.168.1.2) ;; WHEN: Wed May 30 00:05:41 EDT 2018 ;; MSG SIZE rcvd: 50 alan at P100 in ~ $ ping 192.168.1.101 PING 192.168.1.101 (192.168.1.101) 56(84) bytes of data. 64 bytes from 192.168.1.101: icmp_seq=1 ttl=64 time=2.51 ms 64 bytes from 192.168.1.101: icmp_seq=2 ttl=64 time=2.38 ms 64 bytes from 192.168.1.101: icmp_seq=3 ttl=64 time=2.52 ms ^C --- 192.168.1.101 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 2.387/2.474/2.526/0.074 ms
Thanks.
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