Better systemd/exec errors

[SpComb]

Conditions:
  Type             Status    LastHeartbeatTime                 LastTransitionTime                Reason                       Message
  ----             ------    -----------------                 ------------------                ------                       -------
  OutOfDisk        False     Tue, 29 May 2018 08:29:23 +0000   Wed, 23 May 2018 15:43:54 +0000   KubeletHasSufficientDisk     kubelet has sufficient disk space available
  MemoryPressure   False     Tue, 29 May 2018 08:29:23 +0000   Wed, 23 May 2018 15:43:54 +0000   KubeletHasSufficientMemory   kubelet has sufficient memory available
  DiskPressure     False     Tue, 29 May 2018 08:29:23 +0000   Fri, 25 May 2018 14:15:35 +0000   KubeletHasNoDiskPressure     kubelet has no disk pressure
  PIDPressure      False     Tue, 29 May 2018 08:29:23 +0000   Wed, 23 May 2018 15:43:54 +0000   KubeletHasSufficientPID      kubelet has sufficient PID available
  Ready            True      Tue, 29 May 2018 08:29:23 +0000   Fri, 25 May 2018 14:15:45 +0000   KubeletReady                 kubelet is posting ready status. AppArmor enabled
  HostUpgrades     Unknown   Tue, 29 May 2018 08:29:02 +0000   Tue, 29 May 2018 08:29:02 +0000   UpgradeFailed                systemd/exec host-upgrades.service failed: [/bin/sh -x /run/host-upgrades/host-upgrades.sh]
+ set -ue
+ apt-get update
Hit:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit:2 http://archive.ubuntu.com/ubuntu xenial InRelease
Hit:3 http://archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu xenial-backports InRelease
Hit:5 https://download.docker.com/linux/ubuntu xenial InRelease
Hit:6 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
Reading package lists...
+ unattended-upgrade -v
  HostUpgradesReboot   Unknown   Tue, 29 May 2018 08:29:02 +0000   Tue, 29 May 2018 08:29:02 +0000   UpgradeFailed