Boot device not found after installing 18.04 dual boot

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I’m pretty new to all this, so bear with me.

Trying to set up dual boot on my HP Spectre; more or less used this guide (https://itsfoss.com/install-ubuntu-1404-dual-boot-mode-windows-8-81-uefi/).

Now, I got the dreaded “Boot device not found” and hard drive 3F0 error.

Any tips?

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Could you please try and see if similar steps as the ones below are applicable to you?

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