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Firstly, here is my device config: A 120 GB SSD that has Windows 10 installed, a separate 1TB HDD (now used for storage), UEFI type BIOS.

I am considering to install Ubuntu 18.04.3 LTS on the same SSD that has Windows. What are the steps I need to follow to do that?

Also, shall I reconsider, for any reason, to install Ubuntu on the HDD instead?

Please feel free to describe anything that I need to know, I don't want to mess up with my machine.

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  • What is "UEFI type BIOS"?
    – user1686
    Nov 25 '19 at 5:58
  • @grawity Likely means they have UEFI... unfortunately, OEMs have chosen the route of incorrect terminology to make it "easier" on consumers; as such, OEMs refer to UEFI as BIOS (it'd be interesting to have an OEM try to square that circle in an explanation). Tushar: You're going to run out of space fairly quickly trying to dual boot a 120GB SSD, unless you're storing user data on a separate drive and aren't installing a lot of programs. There's likely only ~100GB of usable space, 10% must stay empty for Over-Provisioning, leaving 90GB for Windows, Ubuntu, and all user data for both.
    – JW0914
    Nov 25 '19 at 7:25
  • Thanks @JW0914 but what if I allocate 70GB for Ubuntu? Is that gonna be enough for Ubuntu? Do I have the options to install larger apps on separate drive like in windows? I wont be using windows that often and whatever I need, are already installed leaving me 80GB of free space.
    – Tushar
    Nov 25 '19 at 9:20
  • @Tushar You currently have 80GB of free space? Min. system partition size for Windows is 32GB, and bi-annual updates will require another ~11GB, so ~45GB would be around the min for normal use. You can shrink it further by removing functionality, and I would recommend checking out threads on the MSFN forum if you choose that route. A >=256GB SSD would be the recommended route, eliminating the size constraints, and with Black Friday this Friday and Cyber Monday a week from today, you'll be able to pick up an NVMe or MLC/TLC SSD for fairly cheap (avoid QLC SSDs).
    – JW0914
    Nov 25 '19 at 14:01
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  • I did this on my laptop with UEFI a few days ago. Here's what I did:
    • Shrink the windows 10 partition to make space for Ubuntu, I shrank about 30 GB from it (you can do this through windows disk management)
    • Boot to a USB flashed with the copy of Ubuntu
    • If you need a swap partition, select "something else" on the installation type page. From there, create two partitions, one for
      swap, the other for your actual OS (ext4).
    • If you don't need a swap partition, just hit "Install Ubuntu alongside Windows 10". Verify it does install to the correct
      partition though.
    • Follow the rest of the steps in the installation and you'll be able to select an OS to boot from once you restart.
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  • Why in the world would you disable Secure Boot when Ubuntu supports it? If it doesn't automatically boot, you'll need to add it as a Secure Boot option in the UEFI settings (usually on the boot page)
    – JW0914
    Nov 25 '19 at 8:26
  • Personally I don't need secure boot, so I disable it for anything that isn't Windows. Edited.
    – Ryan
    Nov 27 '19 at 6:23
  • You don't need a security feature that prevents malware from affecting the bootloader of an OS?
    – JW0914
    Nov 27 '19 at 11:53
  • Thanks @JW0914 I could install it without disabling the secure boot.
    – Tushar
    Nov 28 '19 at 5:49
  • How can I get/install a WiFi adapter without internet connection? I cannot connect to the internet if I don't connect to WiFi.
    – Tushar
    Nov 28 '19 at 5:51

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