I can share the output of "systemd-analyze plot": please see attached file 
'systemd_startup_04.svg'.
If needed I can provide output of some other commands: just let me know what 
else might be useful.

** Attachment added: "svg plot of system startup"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1884455/+attachment/5386859/+files/systemd_startup_04.svg

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https://bugs.launchpad.net/bugs/1884455

Title:
  pulseaudio creates /root/.config/pulse/ before zfs-mount.service can
  mount the /root dataset

Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  I use 'zfs' and have /root as its own dataset which is mounted during
  startup by 'zfs-mount.service'.

  At one of the latest upgrades, the 'zfsutils-linux' package failed to
  update because the service 'zfs-mount' service had an issue and could
  not mount the '/root' dataset because the '/root' directory was not
  empty (temporary solution was to rename /root and call 'zfs mount'
  again).

  Further investigation shows that everytime at startup, the /root
  directory is created before the 'zfs-mount.service' has a chance to
  mount the 'root' dataset.

  The culprit seems to be something pulseaudio related: the content of /root 
folder after startup is as follows:
  -----------------
  root@minighost:~# tree -a /root
  .
  ├── .cache
  └── .config
      └── pulse
          └── fe1417537ae0451abdb60c5df28fe825-runtime -> 
/tmp/pulse-PKdhtXMmr18n

  4 directories, 0 files
  root@minighost:~#
  -----------------  


  Extra details:

  - Ubuntu release:
  -----------------
  root@minighost:~# lsb_release -rd
  Description:  Ubuntu 20.04 LTS
  Release:      20.04
  -----------------

  
  - status of 'zfs-mount.service' is the following:
  -----------------  
  root@minighost:~# systemctl status zfs-mount
  ● zfs-mount.service - Mount ZFS filesystems
       Loaded: loaded (/lib/systemd/system/zfs-mount.service; enabled; vendor 
preset: enabled)
       Active: failed (Result: exit-code) since Sun 2020-06-21 12:56:08 CEST; 
6h ago
         Docs: man:zfs(8)
      Process: 2062 ExecStart=/sbin/zfs mount -a (code=exited, status=1/FAILURE)
     Main PID: 2062 (code=exited, status=1/FAILURE)

  Jun 21 12:56:08 minighost systemd[1]: Starting Mount ZFS filesystems...
  Jun 21 12:56:08 minighost zfs[2062]: cannot mount '/root': directory is not 
empty
  Jun 21 12:56:08 minighost systemd[1]: zfs-mount.service: Main process exited, 
code=exited, status=1/FAILURE
  Jun 21 12:56:08 minighost systemd[1]: zfs-mount.service: Failed with result 
'exit-code'.
  Jun 21 12:56:08 minighost systemd[1]: Failed to start Mount ZFS filesystems.
  root@minighost:~#
  -----------------  


  - software versions:
  -----------------
  root@minighost:~# apt-cache policy pulseaudio
  pulseaudio:
    Installed: 1:13.99.1-1ubuntu3.3
    Candidate: 1:13.99.1-1ubuntu3.3
    Version table:
   *** 1:13.99.1-1ubuntu3.3 500
          500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1:13.99.1-1ubuntu3.2 500
          500 http://security.ubuntu.com/ubuntu focal-security/main amd64 
Packages
       1:13.99.1-1ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

  root@minighost:~# apt-cache policy zfsutils-linux
  zfsutils-linux:
    Installed: 0.8.3-1ubuntu12.1
    Candidate: 0.8.3-1ubuntu12.1
    Version table:
   *** 0.8.3-1ubuntu12.1 500
          500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       0.8.3-1ubuntu12 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
  -----------------

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: pulseaudio 1:13.99.1-1ubuntu3.3
  ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41
  Uname: Linux 5.4.0-37-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dumi       2419 F.... pulseaudio
  CasperMD5CheckResult: skip
  Date: Sun Jun 21 19:17:20 2020
  InstallationDate: Installed on 2018-09-08 (651 days ago)
  InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 
20180608-09:38
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  SourcePackage: pulseaudio
  UpgradeStatus: Upgraded to focal on 2020-04-24 (57 days ago)
  dmi.bios.date: 12/11/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.12.1
  dmi.board.name: 0F6P3V
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.12.1:bd12/11/2019:svnDellInc.:pnXPS139370:pvr:rvnDellInc.:rn0F6P3V:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9370
  dmi.product.sku: 07E6
  dmi.sys.vendor: Dell Inc.

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