I have recently bought a ThinkPad E14 Gen 4 with an Intel core-i7 1260P, and am trying to dual boot Ubuntu 22.04 LTS alongside Windows.

My laptop came with Windows 11 Pro preinstalled and I have not messed with that or my UEFI settings. I flashed the image (from Canonical's website) to a USB drive using Rufus, and attempted booting to it. However, when I select the USB drive in the boot menu, nothing happens - once I exit the boot menu, the laptop just boots back to Windows.

How do I proceed?

2 Answers 2


TL;DR Go into your BIOS/UEFI using the F1 key. Then go to Security > Secure Boot > toggle Allow Microsoft 3rd party UEFI CA to be on. Save and exit (F10), and then use F12 to boot to the Ubuntu install media.

I found the source of the problem. It was Secure Boot, though that initially confused me because Ubuntu is supposed to support secure boot.

Well, I found this strange option in the BIOS/UEFI and decided to investigate: Allow Microsoft 3rd party UEFI CA. Turns out that Lenovo had published a document advising about this change, mandated by Microsoft: https://download.lenovo.com/pccbbs/mobiles_pdf/Enable_Secure_Boot_for_Linux_Secured-core_PCs.pdf

Enabling that setting allowed me to boot to the Ubuntu installer.

I did this on a ThinkPad E14 Gen 4 running Windows 11 Pro with BitLocker enabled. Consequently, when I booted back to Windows, I was asked for a BitLocker key. I was able to follow instructions from Microsoft's website (given on the screen when asked for the key), but you might want to consider retrieving/storing said key before you change UEFI settings.

  • This solution worked for me when installing Fedora 38 Workstation on a ThinkPad P14s gen 3. Thank you.
    – Raibyo
    Commented May 4, 2023 at 19:37

maybe it didn't flash correctly, try Ventoy instead of Rufus, its easier

  • Didn't help. Ultimately seems like Microsoft was messing around with secure boot. See my solution. Commented Dec 30, 2022 at 19:58

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