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I decided to install Ubuntu on my laptop alongside Windows 10. I downloaded the Ubuntu 20.04 iso file from the official Ubuntu website. I formatted my USB from NTFS to FAT32 and used Rufus 3.12 to make a bootable USB drive with the Ubuntu .iso file that I had downloaded.

After getting into the BIOS I selected the boot from USB in the boot menu, but I didn't get any "Install Ubuntu" option. It seemed to me as if Ubuntu has already been installed, but it hasn't. I also tried Universal USB Installer 19.9.5 instead of Rufus, but the result was same.

This is the next screen after I chose booting from USB in the boot menu.

enter image description here

These are the errors I got after choosing the first "Ubuntu" option.

These are the errors I got after choosing the first "Ubuntu" option

Unable to find a medium containing a live file system
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    Did you disable Secure Boot in the BIOS/UEFI ? – Raffles Oct 25 '20 at 11:39
  • Yes, but didn't help – hugo159 Oct 25 '20 at 12:18
  • What machine is it? – Raffles Oct 25 '20 at 12:20
  • It is Asus x571gt-bq103t. – hugo159 Oct 25 '20 at 12:22
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    I turned off the Windows fast startup and it worked, thank you. – hugo159 Oct 25 '20 at 21:27
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The answer in this case is

  1. to make sure that Secure Boot is disabled in the BIOS/UEFI and
  2. Disable Windows fast startup (Win 8.1 and Win 10). This is done by booting into Windows, and calling up the Settings menu and looking for "Turn on fast startup", then uncheck it.

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