[Bug 1829625] Re: disco64 vagrant box slow boot due to missing ttyS0 (uartmode1 not set to a log file in virtualbox)

[Steve Langasek]

** Branch unlinked: lp:livecd-rootfs

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https://bugs.launchpad.net/bugs/1829625

Title:
  disco64 vagrant box slow boot due to missing ttyS0 (uartmode1 not set
  to a log file in virtualbox)

Status in cloud-images:
  Confirmed
Status in livecd-rootfs package in Ubuntu:
  Confirmed

Bug description:
  due to this issue the boot time of ubuntu 19.04 (disco) requires about
  2minutes on my systems instead of about 5-7 seconds.

  environment:
  * ubuntu 18.04
  * vagrant v2.0.2
  * virtualbox 6.0.8

  steps to reproduce:
  1) initialize vagrant: `vagrant init ubuntu/disco64`
  2) start vagrant image: `vagrant up`

  get the virtual machine name or uuid, and read the 'uartmode1' setup:
  `VBoxManage showvminfo <uuid|vmname> --machinereadable |grep ^uart`
  will result in:
  ----
  uart1="0x03f8,4"
  uartmode1="disconnected"
  uarttype1="16550A"
  uart2="off"
  uart3="off"
  uart4="off"
  ----

  with 'uartmode1' disconnected, meaning 'ttyS0' not attached to the vm
  ubuntu 19.04 will take a long time to boot.

  with previous ubuntu versions this works fine, e.g. cosmic64 or
  bionic64.

  ----
  uart1="0x03f8,4"
  uartmode1="file,/somedir/vagrant-test-cosmic64/ubuntu-cosmic-18.10-cloudimg-console.log"
  uarttype1="16550A"
  uart2="off"
  uart3="off"
  uart4="off"
  ----

  if the ttyS0 should no longer be attached by default then the grub parameter 'GRUB_CMDLINE_LINUX_DEFAULT' in '/etc/default/grub.d/50-cloudimg-settings.cfg' needs to be adjusted from:
  GRUB_CMDLINE_LINUX_DEFAULT="console=tty1 console=ttyS0"
  to 
  GRUB_CMDLINE_LINUX_DEFAULT="console=tty1"

  
  the impact is best visible when the vm is started with a gui, either from virtualbox gui or with vagrant in 'Vagrantfile':
  ----
     config.vm.provider "virtualbox" do |vb|
       # Display the VirtualBox GUI when booting the machine
       vb.gui = true  
     end
  ----

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