[Bug 1929774] Re: do-release-upgrade hangs when systemd-networkd.service fails to restart cleanly; causes sshd issues

[Launchpad Bug Tracker]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no
activity for 60 days.]

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1929774

Title:
  do-release-upgrade hangs when systemd-networkd.service fails to
  restart cleanly; causes sshd issues

Status in ubuntu-release-upgrader package in Ubuntu:
  Expired

Bug description:
  We upgraded some baremetal machines from bionic to focal. During the
  d-r-u process, it got stuck when it tried to restart systemd-
  networkd.service [0]. This also caused the machine to be unreachable
  through ssh. The only way to work around this issue was to have an
  existing ssh session on the machine during the upgrade. Then, I was
  able to restart systemd-networkd.socket and systemd-networkd.service
  to get things working again; this unstuck the d-r-u process.
  Additionally, I had to restart sshd for that service to work as well.
  Other services listening on other ports worked fine. This was a juju
  unit, and "juju run --machine $num" worked to issue commands remotely
  on the machine.

  [0]
  Created symlink /etc/systemd/system/sysinit.target.wants/systemd-pstore.service  /lib/systemd/system/systemd-pstore.service.
  Job for systemd-networkd.service failed because the control process exited with error code.
  See "systemctl status systemd-networkd.service" and "journalctl -xe" for details.

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