[Bug 784020] Re: ubiquity doubles stated filesystem size requirements

[Jonathan Marsden]

I think the root cause of the issue may be the conflation of two
distinct properties: disk space occupied by the OS when installed, and
the extra free disk space needed, over and above that, for it to install
and then boot successfully.  This second value is what is currently
being "guessed" within ubiquity, with unfortunate results.

Therefore, perhaps we should have casper/filesystem.size represent the
installed filesystem size for the installed distribution, and
casper/filesystem.min-free-diskspace for the additional space needed.

This would mean an end to the "fudge factor " approach in this ubiquity
code, it would simply add the two values together to compute the minimum
disk size needed for an install.  If the second file is missing, fine,
treat that value as zero (or even use a fudge factor, for improved
backward compatibility?).  Each flavour of Ubuntu would be responsible
for creating an appropriate filesystem.min-free-diskspace file.

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https://bugs.launchpad.net/bugs/784020

Title:
  ubiquity doubles stated filesystem size requirements

Status in Ubiquity:
  Invalid
Status in Xubuntu Website:
  Fix Released
Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  The download page on xubuntu.org says that it requires 2GB of disk
  space, whereas the installer refuses to install unless you have at
  least 4.4GB of free disk space.