[Bug 1290236] Re: ubiquity gpt ext4 format error

[Phillip Susi]

Both Ubiquity and gparted format the same way: by running mke2fs.  The
only thing I can think of is that having it already formatted gave more
time for the block groups to finish being initialized after being
mounted.

You could check this with the debugfs stats command.

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https://bugs.launchpad.net/bugs/1290236

Title:
  ubiquity gpt ext4 format error

Status in “ubiquity” package in Ubuntu:
  Invalid

Bug description:
  1.  Create an ext4 partition on a GPT disk using gparted (v16 or v18) but do not format it
  2.  Install 64-bit Ubuntu-14.04 desktop via 2014-03_09 07:49 iso from a USB stick checking the format box
  3.  Back up the newly created installation using Acronis True Home build 6673
  4.  Observe that sector-by-sector mode was forced because the ext4 partition was not recognized as such
  5.  Create a second ext4 partition and format that partition using gparted (v18) 
  6.  Install 64-bit Ubuntu-14.04 desktop via 2014-03_09 07:49 iso from a USB stick leaving the format box unchecked
  7.  Back up the newly created installation using Acronis True Home build 6673
  8.  Observe that normal compression was applied resulting in a much smaller image because the ext4 partition was recognized as such
   
  It is my opinion that  incorrect formatting might lead to manifestation of some nasty intermittent bugs. Hopefully these steps which are 100% reproducible will enable the bug to be located quickly.

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