[Bug 1866535] Re: Ubuntu Server 19.10 installer uses wrong NVMe path for Samsung 970 EVO Plus M.2 SSD (could not stat device - failed to find device at path)

[Paul White]

** Package changed: debian-installer (Ubuntu) => subiquity

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Title:
  Ubuntu Server 19.10 installer uses wrong NVMe path for Samsung 970 EVO
  Plus M.2 SSD (could not stat device - failed to find device at path)

Status in subiquity:
  New

Bug description:
  I am booting an Ubuntu Server 19.10 image (ubuntu-19.10-live-server-
  ppc64el.iso downloaded Jan 18, 2020) on a DVD to install Ubuntu on a
  RaptorCS Blackbird with an IBM Power9 CPU (ppc64el/ppc64le
  architecture) and a Samsung 970 EVO Plus M.2 SSD attached via an PCIe
  v4 adapter card.

  The installer does recognize the NVME initially but when the
  installation finally starts it does no longer recognize the path to
  the NVMe and says:

  Error: Could not stat device /dev/disk/by-id/wwn-eui.0025... - No such file or directory
  ...
  An error occured handling 'disk-nvme0n1': OSError - [Errno Failed to find device at path: %s] /dev/disk/by-id/wwn-eui.0025...
  ...
  Traceback:
  ...
  File "/snap/subiquity/1286/lib/python3.6/site-packages/curtin/commands/block_meta.py", line 182, in devsync

  This possible bug was also reported for Intel architecture:
  https://egevig.org/linux/installing-ubuntu-server-19-10-on-intel-nuc

  Current workaround:

  Follow the installer until you have specified the partitions but do
  not yet hit Done to apply this workaround:

  - Press Ctrl+Alt+F2 to enter a console outside of the installation
  program.

  - If you are not already in a root shell: Login with the user created
  earlier in the installation process

  - Find out your SSD ID show as folder under
    /dev/disk/by-id/

  - Create a symbolic link to your SSD (try with and without "nvme-" and
  prefix, eg. "nvme-eui.0025... and "eui.0025...":

      # If you have more than one NVMe SSD you may have to change device number eg. to /dev/nvme0n2 for the second SSD...
      sudo ln -s /dev/nvme0n1 /dev/disk/by-id/wwn-eui.0025...

  - Exit the shell by pressing Ctrl+D or typing exit.

  - Switch back to the installer using Ctrl+Alt+F1.

  - Now choose "Done" to apply and use the partitions. The installer
  will continue the installation on this NVME now.

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