I made some changes in grub by mistake, and now I m getting Verification failed :0x1A security violation In My Hp pavilion notebook laptop is dual bootable and I m also not able to open any boot option during startup time.
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Can you boot from any Ubuntu install media? (USB/DVD) – 0x2b3bfa0 Aug 25 '18 at 21:26
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Nope ,Even boot option is not coming after pressing F12 – Mrinal Raj Feb 10 '19 at 11:39
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For those who have stumbled on this question recently, Canonical updated their UEFI signing keys. More info here: https://askubuntu.com/a/1456906/1598467 – ArrayBolt3 Feb 27 '23 at 02:10
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Your last resort would be removing the bios chip from the motherboard using a hot air solder, then flashing it with a usb programmer. Take the laptop to a repair shop and ask them to do that.

theroguecode
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Thanks @theroguecode for the advice. This issue was resolved by the same way as u mentioned. – Mrinal Raj May 21 '20 at 06:39
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Theoretically this probably will/did work, but it's somewhat overkill. – ArrayBolt3 Feb 27 '23 at 02:11