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I have tried to install Ubuntu alongside my windows 8 but when I run the installer, in my bootable flash the installer does not recognize my windows partitions. It shows my hard drive as one unallocated 500GB. I researched and someone had a similar problem and he was instructed to run the following command sudo fdisk -lu inside the Ubuntu installer. From his output he was told that some of drives are overlapping. I have run the same command in my installer and this is my output:

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.


Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x55f36f79

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      718847      358400    7  HPFS/NTFS/exFAT
/dev/sda2          718848   103118847    51200000    7  HPFS/NTFS/exFAT
/dev/sda3       103118848   185038847    40960000    7  HPFS/NTFS/exFAT
/dev/sda4       185038848   976771071   395866112    f  W95 Ext'd (LBA)
/dev/sda5       185040896   976771071   395865088    7  HPFS/NTFS/exFAT

I have used this same Ubuntu installer on my friends machine and it works well. I have even tried to install mint from a DVD and i get the same problem. When I run the command above in both installers I get the same output. When I run another command sudo gparted -l i get the following output.

Warning: /dev/sda contains GPT signatures

indicating that it has a GPT table. However, it does not have a valid fake msdos partition table, as it should. Perhaps it was corrupted -- possibly by a program that doesn't understand GPT partition tables. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Is this a GPT partition table? Yes/No?

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You have GPT disk there are a lot of solutions you can find within this forum no need to create new topic. Check this and read it.

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  • On the contrary, any on-topic question that is not represented in the Stack Exchange Network is welcome to be added to the network. In fact, that is the goal. From the tour: "With your help, we're working together to build a library of detailed answers to every question about Ubuntu.". Furthermore, all resolving advice is ideally hard-written into answers. Stack Exchange does not encourage "link-only answers" because they can break or die; this means curators will need to resurrect content with the wayback machine -- this isn't a fun job. Jan 11, 2022 at 8:11

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