[Bug 798285] Re: Installer won't detect existing oS or partition table.

[Evertjan Garretsen]

After looking throug many forum entries i managed ubuntu to see the
installed windows 7 by removing the  windows recovery partition.
(WARNING: don't do this if you are not familiar with reinstalling
windows without using the recovery tools for your computer)

I booted windows and removed the partition in windows. After restarting
the Ubuntu installer windows 7 was detected. I read somewhere this is
caused by a file that wants to be at the end of the disk and that a
minimum of X blocks on the end of the disked should be reserved for
this. Using gdisk before i removed the windows recovery partition said:
“overlapping the last partition by xx blocks"..

I wanted to dual-boot Ubuntu with Windows, but as i use Ubuntu 99% of
the time i just wanted Ubuntu to work, no matter what the costs. So i
deleted the recovery partition (after making backups of it using asus
tools). And Ubuntu installed just wonderful. Unfortunately the UEFI /
GRUB / MBR / whatever problems still don't allow me to start windows,
but hey Ubuntu is working just fine!

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https://bugs.launchpad.net/bugs/798285

Title:
  Installer won't detect existing oS or partition table.

Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  I was trying to install a newer version of Ubuntu, 10.04/10.10. When I
  use live CD, it won't detect any existing OS or partitions. Same with
  Alternative installer: It won't see any partitions, just my hard
  drive. There have been many questions about this but none of them
  seemed to help.

  I wanted to have a new version of Ubuntu but preferably without having
  to re-install windows as well. I really don't know where the partition
  table went. The installers just don;t see anything. Both operating
  systems work fine, GRUB is always working correctly.

  The problem is described in more detail in question #159921. I hope
  this helps.

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