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I am trying to install Windows and Ubuntu in dual boot configuration. I created 100GB of unallocated space on a disk to install Ubuntu. https://i.imgur.com/H96YMjb.png

But when I select a custom install in Ubuntu, I see many partitions image image2

I think that I should only see the 3 partition, so I'm confused about which partition to install Ubuntu.

I also realized that I don't have a system reverse partition. Will that cause a problem with installing operating systems in dual boot configuration?

Should I format the other unknown partition?

I am new to Ubuntu.

Nmath
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Narakunizer
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  • Is this an old BIOS/MBR install of Windows? That would be before 2012 when Microsoft required vendors to use UEFI/gpt for all new installs. Even a BIOS install may have Windows fast start up on. Or UEFI/BIOS may not be in AHCI mode? https://askubuntu.com/questions/843153/unable-to-mount-windows-10-partition-it-is-in-an-unsafe-state & https://askubuntu.com/questions/145902/unable-to-mount-windows-ntfs-filesystem-due-to-hibernation Also what brand/model system? And what video card/chip? Some need additional settings. – oldfred Aug 28 '22 at 19:31
  • `sdb` and `sdc` are entirely different physical disks than `sda`. Perhaps that's where you're confused? – Nmath Aug 28 '22 at 19:39
  • If a "system reverse partition" is a Windows restore partition, Ubuntu doesn't care about whether you have that or not. Open a terminal and type `lsblk` and you'll get a nice text listing of all the disks and their partitions. – Organic Marble Aug 28 '22 at 19:49
  • Its a legecy bios with AHCI MODE hp 6300 pro mt with intel 2500 – Narakunizer Aug 28 '22 at 21:21
  • well I don't know the difference between sdb and sdc but I mean it should be 3 partition only shown but its oky I will check the difference – Narakunizer Aug 28 '22 at 21:23
  • Thanks for explaning that ubuntu doesn't care about system reverse partition – Narakunizer Aug 28 '22 at 21:24
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    Disks in Ubuntu are labeled with the scheme sdX# where X is a letter that represents a whole disk and # is a number representing a partition. So `sda1` would refer to the first partition on the first disk. `sdc4` would represent the fourth partition on the third disk. And so on. A letter will represent only one physical disk and all partitions on that disk will use the same letter. So when you are confused seeing all of these partitions, make sure you are noticing that some partitions are on different physical disks. Any partitions that start with `sdb` are never on the same disk as `sda` – Nmath Aug 29 '22 at 08:56
  • @Nmath thank you for awesome explaning – Narakunizer Aug 29 '22 at 09:31

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