[Bug 1909792] Re: System generated network bond fails after kernel update.

[Brian Murray]

** Package changed: ubuntu => netplan.io (Ubuntu)

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https://bugs.launchpad.net/bugs/1909792

Title:
  System generated network bond fails after kernel update.

Status in netplan.io package in Ubuntu:
  New

Bug description:
  Server info (20.04)
  After i updated my docker server yesterday i had to reboot because of a kernel update (new version 5.4.0-58-generic x86_64). My main network interface that i use all of a sudden failed to apply its configuration and was not able to connect. I believe this issue is linked to this bug (Bug #1860926) but not exactly the same issue.
  When setting up my server on first install i used the startup walk-through to auto configure my eno1&eno2 network bond. I unfortunately didn't save the previous netplan yaml to post here,but it had said it was written by subiquity. Every time i tried to apply the netplan it replied that eno2 was not defined. I had to change the yaml to this configuration to get my link back up.

  network:
    bonds:
      bond0:
        interfaces:
        - eno1
        - eno2
        parameters:
          mode: balance-rr
    ethernets:
      eno1: {}
      eno2: {}
    version: 2
    bridges:
      br0:
        addresses:
          - 172.16.10.2/24
        dhcp4: false
        gateway4: 172.16.10.254
        nameservers:
          addresses:
            - 172.16.10.251
            - 172.16.10.254
          search: []
        interfaces:
          - bond0

  I found this in my syslog right after the reboot from update,

  /usr/lib/systemd/system-generators/netplan failed with exit status 1.
  PRIORITY	3
  SYSLOG_FACILITY	3
  SYSLOG_IDENTIFIER	systemd
  SYSLOG_PID	675
  _BOOT_ID	de464fb514a34d149ca9ace3c7ee5a83
  _HOSTNAME	bagul.dev
  _MACHINE_ID	e610a37f963a4ad499cd78b0e181e679
  _SOURCE_MONOTONIC_TIMESTAMP	46968227
  _TRANSPORT	kernel
  __CURSOR	s=0b1205c7c02b486389e1f63666ec005f;i=15575e;b=de464fb514a34d149ca9ace3c7ee5a83;m=2e45a41;t=5b77d16e3b0b9;x=e5d61684f5e8d985
  __MONOTONIC_TIMESTAMP	48519745
  __REALTIME_TIMESTAMP	1609122766368953

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