[SOLVED] How can I disable secure boot on my MacBook Pro 2011?

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Mar 23, 2020
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Hello,
today I tried to install Ubuntu on my MacBook but when I start from the USB-stick, an error appears and it says that I the system cannot boot from the stick because of secure boot.
How can I disable that?
I have already tried to do it at Disk Utilities on Startup Secure Utility but on this menu, I can just add an firmware password.

Sorry for the bad English and have a great day!

Best regards
Leon
 

firelighter487

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