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[Michael Hudson-Doyle <mwhudsonlp@xxxxxxxxxxx>]

** Changed in: subiquity
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1848535

Title:
  'PMBR' is not one of ['dos', 'gpt', 'mac', 'msdos', 'vtoc']

Status in curtin:
  Fix Released
Status in subiquity:
  Fix Released

Bug description:
  I had a successful installation with subiquity on a T420 with two
  disks. I then zapped both disks (sgdisk -Z /dev/sda and /dev/sdb) and
  rebooted into the installer to try another installation.

  This time, however, it failed at "Probing for devices to isntall to failed". Logs show this traceback:
  2019-10-17 15:33:34,481 ERROR curtin:1230 Validation error: 'PMBR' is not one of ['dos', 'gpt', 'mac', 'msdos', 'vtoc'] in 
  {
   "id": "disk-sdb",
   "path": "/dev/sdb",
   "ptable": "PMBR",
   "serial": "ST9500420AS_5VJEJ147",
   "type": "disk",
   "wwn": "0x5000c50044423236"
  }
  NoneType: None
  2019-10-17 15:33:34,481 ERROR block-discover:161 load_probe_data failed restricted=False
  Traceback (most recent call last):
    File "/snap/subiquity/1284/lib/python3.6/site-packages/subiquity/controllers/filesystem.py", line 158, in _probe_done
      self.model.load_probe_data(probe.result)
    File "/snap/subiquity/1284/lib/python3.6/site-packages/subiquity/models/filesystem.py", line 1310, in load_probe_data
      self.reset()
    File "/snap/subiquity/1284/lib/python3.6/site-packages/subiquity/models/filesystem.py", line 1138, in reset
      config = storage_config.extract_storage_config(self._probe_data)
    File "/snap/subiquity/1284/lib/python3.6/site-packages/curtin/storage_config.py", line 1232, in extract_storage_config
      raise RuntimeError("Extract storage config does not validate.")
  RuntimeError: Extract storage config does not validate.

  
  /dev/sda:
  isk /dev/sda: 447.13 GiB, 480103981056 bytes, 937703088 sectors
  Disk model: INTEL SSDSC2BP48
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes

  /dev/sdb:
  Disk /dev/sdb: 465.78 GiB, 500107862016 bytes, 976773168 sectors
  Disk model: ST9500420AS     
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disklabel type: dos
  Disk identifier: 0x00000000

  Device     Boot Start       End   Sectors   Size Id Type
  /dev/sdb1           1 976773167 976773167 465.8G ee GPT

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