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I'm trying to dua boot my laptop (Lenovo thinkPad i7).

  1. first I installed Windows 10, on a 100GB partion. left 400GB for later install ubuntu.
  2. when installing Ubuntu 20.04, as shown in many manuals/ Videos - the part that you should choose "install alongside window10" does not show in menus, but saying that not no other operation system was detected.

Following one of the manuals on-line , the part of UEFI (circled in red) does not show. see pic.

What should I do?

guyd
  • 987

2 Answers2

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In order to get the guided "Install Alongside Windows" option, all of the following must be true:

  1. You need viable bootable Ubuntu installation media. In order to confirm this, you must verify the integrity of the downloaded ISO by comparing checksums. You must also verify the integrity of the flash.

  2. You need enough unpartitioned free space for Ubuntu. The minimum system requirement for Ubuntu is 25GB. Do not create a partition for Ubuntu. It must be unpartitioned free space. The installer will create partitions for you.

  3. You must boot the USB using the same UEFI or Legacy/BIOS method in which Windows is already installed. Windows is generally installed as a UEFI operating system, so you must boot the USB as a UEFI disk. If you're not sure how to do this, you must read the documentation for your motherboard. Booting a USB is a function of your hardware and not any other operating system. Different motherboards have different interfaces, so you have to figure out the booting process for your particular hardware.

If you need a general reference for creating bootable media and installing Ubuntu, please refer to the official tutorial.

Nmath
  • 12,664
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To sum up all coments and answers given that sovled my case:

  1. Partion table - GPT is for UEFI and MBR is for BIOS
  2. BIOS setup - set UEFI where needed (and not Legacy). Make sure boot will be from UEFI based only (where BOTH is option(Legacy and UEFI), make sure to select UEFI.
  3. HDD partion - prior to any OS installation, use ubuntu's on-stick USB installation, to delete all partions. make sure to create a file parttion table- GPT (using gPart).
  4. Windows installtion - It is recommended to start with windows installtion and only after, Ubnutu. Use Rufus to create a bootable windows installtion. MAKE sure to select GPT in rufus's menu to also create Windwos installation UEFI (as said in section 2 - we are forcing all installation and BIOS setups to use UEFI).
  5. After Windows installtion - Check MSINFO, that result is UEFI and not Legacy.
  6. Ubuntu's installation. -Is Windows was installed as UEFI, ONLY THEN you'll get Install Ubntu alongside Windows at first steps of Ubuntu's installtion.

GOOD LUCK guy

guyd
  • 987