[Bug 1254283] Re: Ubiquity miscalculates maximum partition size

[Seppe Stas]

Nik.Th.: It looks like both this bug and the problem have related
causes. However, the bug in Ubiquity is that it handles the problem
wrong. I would rather not get stuck in an endless loop of popup error
messages while installing Ubuntu.

Of course my problem could be fixed by editing the other partition sizes
so that the new partition can be created without spare sectors. However,
I believe Ubiquity tries to give the user a simplified interface to
manage the partition. This interfaces abstracts the user from sectors
and other fun stuff people play with in a 'real' partition manager. The
abstraction is lost in a rather painful way when the problem occurs,
which isn't very nice and should therefore be prevented imo.

The sollution should be pretty simple: just round the estimated maximum
size down.

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https://bugs.launchpad.net/bugs/1254283

Title:
  Ubiquity miscalculates maximum partition size

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  When trying to combine 2 partitions during the installation of Ubuntu Gnome, I got the following message:
  "Can't have a partition outside the disk!''
  Image: https://pbs.twimg.com/media/BZw5plkCMAEoSD8.png:large

  This message was stuck in a loop, so I couldn't continue or close the installation.
  I combined the partitions by removing one of them, and incresing the size of the other partition to the max size. The second time I tried this, I calculated the maximum size of the new partition, and noticed this was 1MB smaller than the size ubiquity pruposed. 

  This bug is probably caused by a rounding error.

  Ubuntu release: 13.10
  Ubiquity: 2.15.26

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