>From kernel oops, there is no root fs found. Possible root cause is bug
1890797, which needed kernel module udebs are not packed into legacy
ISO. But this bug is filed against daily-live ISO, better to check if we
have same issue on daily-live ISOs too.

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https://bugs.launchpad.net/bugs/1890867

Title:
  kernel trace of 18.04.5 daily image (20200806.1) on Hisilicon D05
  arm64 arch

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  image: 18.04.5 daily image (20200806.1)  bionic-live-server-arm64.iso
  kernel: 4.15.0-112-generic #113-Ubuntu
  platform: Hisilicon D05 arm64 arch

  [Reproducing Steps]
  1. setup pxe boot by following                
https://discourse.ubuntu.com/t/netbooting-the-live-server-installer/14510
  2. pxe boot the machine with the image

  [Expected Result]
  Boot to subiquity

  [Actual Result]
  Kernel trace happened during booting process. Reproducing rate: 2 out of 2.

  
  [    6.643543] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.15.0-112-generic 
#113-Ubuntu
  [    6.651271] Hardware name: Hisilicon D05/BC11SPCD, BIOS 1.50 06/01/2018
  [    6.657871] Call trace:
  [    6.660308]  dump_backtrace+0x0/0x198
  [    6.663957]  show_stack+0x24/0x30
  [    6.667261]  dump_stack+0x98/0xbc
  [    6.670563]  panic+0x128/0x2a4
  [    6.673606]  mount_block_root+0x210/0x2e8
  [    6.677603]  mount_root+0x7c/0x8c
  [    6.680904]  prepare_namespace+0x144/0x1dc
  [    6.684987]  kernel_init_freeable+0x218/0x23c
  [    6.689331]  kernel_init+0x18/0x110
  [    6.692806]  ret_from_fork+0x10/0x18
  [    6.696428] SMP: stopping secondary CPUs
  [    6.700345] Kernel Offset: disabled
  [    6.703821] CPU features: 0x00002008
  [    6.707382] Memory Limit: none
  [    6.710438] ---[ end Kernel panic - not syncing: VFS: Unable to mount root 
fs on unknown-block(0,0)

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