[Bug 1366570] [NEW] GPT partition tables are not properly detected - Ubiquity suggests erasing disk

[Benjamin Tegge]

Public bug reported:

The Ubuntu installer detects 4 or more (primary) partitions during
installation and suggests to erase the disk and therefore remove Windows
(first option) instead of resizing the Windows partition and add
necessary Ubuntu partitions (e.g. "Install along side" option, which is
not displayed).

This may be caused by a missing check of the target systems partition
table type (assuming that installation is not possible on a drive where
there are 4 primary partitions, which is not true for GPT). Resizing
manually and choosing installation option "Something else" works with
14.04.

The device used for testing was of the Toshiba Satellite NB10-A-10
(NB10-A-10N) model line with OEM preinstalled Windows 8. The issue was
reproducable (restoring untouched from diskdump).

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1366570

Title:
  GPT partition tables are not properly detected - Ubiquity suggests
  erasing disk

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  The Ubuntu installer detects 4 or more (primary) partitions during
  installation and suggests to erase the disk and therefore remove
  Windows (first option) instead of resizing the Windows partition and
  add necessary Ubuntu partitions (e.g. "Install along side" option,
  which is not displayed).

  This may be caused by a missing check of the target systems partition
  table type (assuming that installation is not possible on a drive
  where there are 4 primary partitions, which is not true for GPT).
  Resizing manually and choosing installation option "Something else"
  works with 14.04.

  The device used for testing was of the Toshiba Satellite NB10-A-10
  (NB10-A-10N) model line with OEM preinstalled Windows 8. The issue was
  reproducable (restoring untouched from diskdump).

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