This happened to me, too. I first noticed it after upgrading, recently,
to Ubuntu 10.04 from 9.10. I decided I wanted to go from dual-boot (with
WinVista) to single-boot (Ubuntu 10.04 only). I opened GParted, and it
showed my disk, /dev/sda, as wholly "Unallocated Space." Same thing when
I tried booting from a GParted Live CD and from an Ubuntu 10.10 Live CD.

I have not lost any data, but it is very frustrating. Below is the
output of 'sudo fdisk -l /dev/sda':

Disk /dev/sda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xd8000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *       14267       14594     2620416    c  W95 FAT32 (LBA)
/dev/sda2              10        1315    10485760    7  HPFS/NTFS
/dev/sda3   *        1315        6276    39852216+   7  HPFS/NTFS
/dev/sda4            6277       14594    66807327+   f  W95 Ext'd (LBA)
/dev/sda5           14267       14594     2620416   dd  Unknown
/dev/sda6            6277       13935    61520886   83  Linux
/dev/sda7           13936       14266     2658726   82  Linux swap / Solaris

Partition table entries are not in disk order

--And here is the output of 'sudo sfdisk -l /dev/sda':

Disk /dev/sda: 14593 cylinders, 255 heads, 63 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sda1   *  14266+  14593-    327-   2620416    c  W95 FAT32 (LBA)
                start: (c,h,s) expected (1023,254,63) found (1023,0,1)
/dev/sda2          9+   1314-   1306-  10485760    7  HPFS/NTFS
/dev/sda3   *   1314+   6275-   4962-  39852216+   7  HPFS/NTFS
/dev/sda4       6276+  14593-   8318-  66807327+   f  W95 Ext'd (LBA)
/dev/sda5      14266+  14593-    327-   2620416   dd  Unknown
/dev/sda6       6276+  13934    7659-  61520886   83  Linux
/dev/sda7      13935+  14265     331-   2658726   82  Linux swap / Solaris

I'm not expert, but that partition table looks a little odd to me. Any
help?

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https://bugs.launchpad.net/bugs/103794

Title:
  Cannot have overlapping partitions

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