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Malformed security header

Ask Ubuntu Asked by MH Shuvo on October 31, 2021

After installing Ubuntu I shut down my laptop. When I restarted it I got this error message:

Malformed security header
Failed to read header: Invalid Parameter
Failed to load images: Invalid Parameter
start_img() returned Invalid Parameter 

One Answer

Convert Ubuntu from UEFI mode into Legacy mode.

Use this procedure only to convert an UEFI mode Ubuntu installation to boot in BIOS/CSM/legacy mode. Such a conversion may be necessary if some hardware doesn't work correctly under UEFI mode. (Graphics cards are a common source of problems.) Converting to boot in BIOS/CSM/legacy mode while Windows boots in UEFI mode can make the boot process more awkward -- you'll need to use the computer's built-in boot manager to switch between OSs, and some computer's have such poor boot managers that this may be impossible.

  • If Ubuntu is installed on a GPT disk (you can check it via the sudo parted -l command), use GParted partition editor to create a BIOS-Boot partition (1MB, unformatted filesystem, bios_grub flag) at the start of its disk.

  • Start Boot-Repair, and select Advanced options -> GRUB location tab.

  • Uncheck the Separate /boot/efi partition option

    Uncheck the Separate /boot/efi partition option

  • Click the Apply button in the lower right corner.

  • Set up your BIOS so that it boots the HDD in Legacy mode. Generally this setting is located in the Boot tab → Boot order section of the BIOS.

Source: revised from: UEFI - Community Help Wiki

Answered by karel on October 31, 2021

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