[Bug 1900715] Re: The initial screen of Plymouth takes 20 minutes to appear (Groovy live)

[Steve Langasek]

> I know of no reason that we should be mounting ext4 filesystems from the
> host system prior to actually starting the installer. 

Digging into the casper code, this is because from the initramfs we
don't automatically know what device contains the isofs that needs to be
mounted in order to get to the root filesystem, so available devices are
scanned in order to locate it based on contents.  Which means that an
available ext filesystem on /dev/sda is going to be mounted first, and
if it's in bad shape, it may take some time in order for the mount
operation to complete.

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https://bugs.launchpad.net/bugs/1900715

Title:
  The initial screen of Plymouth takes 20 minutes to appear (Groovy
  live)

Status in plymouth package in Ubuntu:
  Incomplete

Bug description:
  The initial screen of Plymouth takes 20 minutes to appear when starting an installation media from a flash drive
  The installation media were created with 
  -Ubuntu disk creation tool
  -Fedora Media Writer
  -Balena Etcher

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: plymouth 0.9.5-0ubuntu2
  ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
  Uname: Linux 5.8.0-25-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu50
  Architecture: amd64
  BootLog: Error: [Errno 13] Permiso denegado: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CasperVersion: 1.455
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct 20 11:26:44 2020
  DefaultPlymouth: /usr/share/plymouth/themes/bgrt/bgrt.plymouth
  LiveMediaBuild: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201020)
  MachineType: Gigabyte Technology Co., Ltd. GA-78LMT-S2
  ProcCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/username.seed maybe-ubiquity quiet splash ---
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=es_ES.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 nouveaudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/username.seed maybe-ubiquity quiet splash ---
  RebootRequiredPkgs:
   linux-image-5.8.0-25-generic
   linux-base
  SourcePackage: plymouth
  TextPlymouth: /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/14/2012
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F4
  dmi.board.name: GA-78LMT-S2
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF4:bd08/14/2012:svnGigabyteTechnologyCo.,Ltd.:pnGA-78LMT-S2:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-78LMT-S2:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-78LMT-S2
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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