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I know my problem sounds pretty common but all advices I found on the internet did not worked for me.

I try to resize partition and I cant lower its size.My previous SSD disk failed and I need to install system on my second HDD disk. HDD was previously formated on win7. I could create new partition instead of old but obviously I want to keep my data untouched. During Ubuntu installation proccess partition manager says its unallocated space but its normally booting to view folders and stuff.

I experience error like:

GPT Signatures error

In this case /dev/sdb/ is linux pendrive but I think it might be related to /dev/sda/ - HDD. I tried to fix this with doing:

  • Changing Boot mode from UEFI to normal mode.
  • Using gparted (error above) with result red exclamation mark near disk.
  • Using fixparts on my HDD (/dev/sda/) with result:

Loading MBR data from /dev/sda

This disk appears to be a GPT disk. Use GNU Parted or GPT fdisk on it!

Exiting!'

  • Using testdisk which wrote MBR to partition (on /dev/sda/)

  • Using gdisk on /dev/sda/ with commands: x then p then w. Gdisk told its valid GPT table.

  • Tried to change in my UEFI storage setting AHCI to IDE.

I know my approach is chaotic, as I just try different internet solutions. Maybe there is something wrong in order of things I did.

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    Windows partitions should be resized from within Windows. Ubuntu does not handle some aspects of NTFS well. You may be much better off using the live CD/USB to copy data from the hard drive to a storage device (such as a USB hard disk) and creating new partitions. – Charles Green Oct 13 '15 at 16:04
  • I agree with Charles; do it from Windows. Do NOT, though, create new partitions in Windows! The Windows disk partitioner can seriously mess that up. Also, the GParted message about /dev/sdb is harmless; ignore it. Some of what you did, such as using TestDisk, is potentially dangerous. Switching the storage type (AHCI to IDE or vice-versa) can render Windows unbootable, but this is easily reversed. If you keep trying things randomly, you will make matters worse, and in a way that might not be so easy to repair! – Rod Smith Oct 13 '15 at 17:22
  • Choose "No" to be shown GParted. The error message exclusively is about /dev/sdb. This happens when there is no valid partition table on your usb stick, which can be perfectly fine and happens if you simply dd the image onto the usb stick. – UTF-8 Oct 13 '15 at 17:23
  • @CharlesGreen Can you transform this to answer? It seems to be valid solution I will accept this.People who found this post should know not to waste time to find extra solutions. – amonowy Oct 14 '15 at 10:49
  • @amonowy Should be an answer now – Charles Green Oct 14 '15 at 13:33
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Windows partitions should be resized from within Windows; Ubuntu does not handle some aspects of NTFS well.

You may be much better off using the live CD/USB to copy data from the hard drive to a storage device (such as a USB hard disk) and creating new partitions.

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Before you continue with any other experimental changes, you should make a complete backup of your Windows Installation.

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