Note: My comment (#34) above is in VirtualBox 6.1.8 and without the
Serial port redirection mentioned in comment #7. With the serial port
redirection everything seems to work properly for me.

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https://bugs.launchpad.net/bugs/1874453

Title:
  ubuntu/focal64 very slow to boot and reboots once

Status in cloud-images:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Using `ubuntu/focal64` version `20200423.0.0`, the boot process is
  extremely slow and the box always reboots once before completing a
  successful boot.  With default settings, this causes a timeout in
  Vagrant waiting for SSH to be available.  Setting a long enough
  timeout it does eventually boot successfully.  For comparison,
  `ubuntu/bionic64` boots successfully in roughly 10 seconds on my
  machine.

  This appears to be the big hang-up:

  Apr 23 14:00:12 ubuntu-focal kernel: [    0.219784] printk: console [tty1] 
enabled
  Apr 23 14:00:12 ubuntu-focal kernel: [   76.448371] printk: console [ttyS0] 
enabled

  I have a hard time telling where exactly it reboots because my
  /var/log/syslog only ends up with the second boot.  I can watch it in
  Virtualbox though and it suddenly reboots, then the second boot
  process runs to completion.  The long delay shown above happens both
  times making the total time to a successful boot very long.  Here is
  the head of my /var/log/syslog:

  Apr 23 14:00:12 ubuntu-focal systemd[1]: Finished Remount Root and Kernel 
File Systems.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Finished Uncomplicated firewall.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Mounting FUSE Control File System...
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Mounting Kernel Configuration File 
System...
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Condition check resulted in Rebuild 
Hardware Database being skipped.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Starting Flush Journal to Persistent 
Storage...
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Condition check resulted in Platform 
Persistent Storage Archival being skipped.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Starting Load/Save Random Seed...
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Starting Apply Kernel Variables...
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Starting Create System Users...
  Apr 23 14:00:12 ubuntu-focal systemd-sysctl[434]: Not setting 
net/ipv4/conf/all/promote_secondaries (explicit setting exists).
  Apr 23 14:00:12 ubuntu-focal systemd-sysctl[434]: Not setting 
net/ipv4/conf/default/promote_secondaries (explicit setting exists).
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Finished udev Coldplug all Devices.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Mounted FUSE Control File System.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Mounted Kernel Configuration File 
System.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Finished Flush Journal to Persistent 
Storage.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Finished Load/Save Random Seed.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Finished Apply Kernel Variables.
  Apr 23 14:00:12 ubuntu-focal systemd-sysusers[435]: Creating group 
systemd-coredump with gid 999.
  Apr 23 14:00:12 ubuntu-focal systemd-sysusers[435]: Creating user 
systemd-coredump (systemd Core Dumper) with uid 999 and gid 999.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Starting udev Wait for Complete 
Device Initialization...
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Finished Create System Users.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Starting Create Static Device Nodes 
in /dev...
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Finished Create Static Device Nodes 
in /dev.
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Starting udev Kernel Device 
Manager...
  Apr 23 14:00:12 ubuntu-focal systemd[1]: Started udev Kernel Device Manager.
  Apr 23 14:00:12 ubuntu-focal kernel: [    0.000000] Linux version 
5.4.0-26-generic (buildd@lcy01-amd64-029) (gcc version 9.3.0 (Ubuntu 
9.3.0-10ubuntu2)) #30-Ubuntu SMP Mon Apr 20 16:58:30 UTC 2020 (
  Ubuntu 5.4.0-26.30-generic 5.4.30)
  Apr 23 14:00:12 ubuntu-focal kernel: [    0.000000] Command line: 
BOOT_IMAGE=/boot/vmlinuz-5.4.0-26-generic root=PARTUUID=fac6339f-01 ro 
console=tty1 console=ttyS0

  
  Subsequent boots are also slow but don't seem to have the extra reboot.
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May  7 16:02 seq
   crw-rw---- 1 root audio 116, 33 May  7 16:02 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  CasperMD5CheckResult: skip
  DistroRelease: Ubuntu 20.04
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  Lsusb-t:
   
  Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
  MachineType: innotek GmbH VirtualBox
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 vboxvideodrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-29-generic 
root=PARTUUID=ff8ca6a0-01 ro console=tty1 console=ttyS0
  ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-29-generic N/A
   linux-backports-modules-5.4.0-29-generic  N/A
   linux-firmware                            N/A
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  Tags:  focal uec-images
  Uname: Linux 5.4.0-29-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.family: Virtual Machine
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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