Your config file is apparently named /etc/netplan/netplan.conf, which
does not match the required "*.yaml" pattern (which is documented in the
netplan(5) manpage and elsewhere).

** Changed in: (Ubuntu)
       Status: New => Invalid

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  Network configuration doesn't survive reboots after bionic dist-

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Bug description:
  I deployed Xenial in this machine with MAAS. After deployment i had
  re-configured interfaces manually (on /etc/network/interfaces), and
  removed /etc/network/interfaces.d. At some point, I upgraded the
  machine from Xenial to Bionic, and everything was working just fine
  with /e/n/i.

  About 2/3 weeks ago, I dist-upgraded bionic for the latest packages,
  and after reboot, networking didn't come up.

  To recover the machine, what i did is:

  1. From the console, brought up the interfaces manually (eno1)
  2. added an IP address manually (ip addr add)
  3. Configured netplan and applied the config: 

      version: 2
      renderer: networkd
              dhcp4: no
              dhcp6: no
              addresses: []
                  addresses: [,]
              dhcp4: no
              interfaces: [usb0]
              dhcp4: no
              addresses: []
                  stp: false
                  forward-delay: 0
                  max-age: 0

  5. Interfaces dont get configured correctly:

  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 scope host lo
         valid_lft forever preferred_lft forever
      inet6 ::1/128 scope host
         valid_lft forever preferred_lft forever
  17: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP 
group default qlen 1000
      link/ether ec:a8:6b:fd:ac:70 brd ff:ff:ff:ff:ff:ff
      inet scope global eno1
         valid_lft forever preferred_lft forever
      inet6 fe80::eea8:6bff:fefd:ac70/64 scope link
         valid_lft forever preferred_lft forever
  19: usb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP 
group default qlen 1000
      link/ether 00:0e:c6:88:b7:9f brd ff:ff:ff:ff:ff:ff
      inet6 fe80::20e:c6ff:fe88:b79f/64 scope link
         valid_lft forever preferred_lft forever
  22: wlp2s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group 
default qlen 1000
      link/ether c4:d9:87:5b:42:62 brd ff:ff:ff:ff:ff:ff

  6. on reboot, the machine goes back to have no networking again, at

  Note that I also have /e/n/i configured.

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