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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1894378

Title:
  Cannot boot after updating kernel to version 5.4.0-45

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After the kernel update from version 5.4.0-42 to version 5.4.0-45 a
  few days ago, the boot process is ending in a BusyBox shell.
  Apparently it cannot properly identify my M.2 NMVe SSD device where my
  root partition is. Indeed, it is not listed in /dev. For now, I'm
  solving this problem by booting the previous kernel, 5.4.0-42. This
  works fine.

  Also, an earlier attempt ended in a different shell that presented the
  error message "Gave up on waiting for root file system device". The
  UUID it indicated as missing is the correct UUID of my root partition,
  which also appears on /etc/fstab.

  I tried to re-build initrd.img-5.4.0-45-generic, but to no avail.

  Let me also mention that in another computer with a non-M.2 SSD,
  kernel 5.4.0-45 boot properly.

  This bug seems to be the one mentioned in the following "Unix & Linux" forum 
question:
  
https://unix.stackexchange.com/questions/607694/ubuntu-20-04-01-not-booting-after-kernel-update

  Many thanks in advance!

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-42-generic 5.4.0-42.46
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ami        3801 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Sat Sep  5 17:42:26 2020
  HibernationDevice: RESUME=UUID=dd70dd06-717a-4acf-a85e-a9ad37cb92ea
  InstallationDate: Installed on 2017-10-04 (1066 days ago)
  InstallationMedia: Kubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 
(20170801)
  IwConfig:
   enp0s31f6  no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 1532:022a Razer USA, Ltd Razer Cynosa Chroma
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Lsusb-t:
   /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
   /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 480M
       |__ Port 8: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
       |__ Port 8: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 12M
       |__ Port 8: Dev 2, If 2, Class=Human Interface Device, Driver=usbhid, 12M
  MachineType: System manufacturer System Product Name
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-42-generic 
root=UUID=85262f0d-cb92-475a-8174-2d6316e199a9 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-42-generic N/A
   linux-backports-modules-5.4.0-42-generic  N/A
   linux-firmware                            1.187.3
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to focal on 2020-05-03 (125 days ago)
  dmi.bios.date: 06/20/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3807
  dmi.board.asset.tag: Default string
  dmi.board.name: H110M-A/M.2
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3807:bd06/20/2018:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH110M-A/M.2:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.sku: SKU
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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