Has anyone installed Sangfor and encountered this issue? How can it be fixed?”

GUNJOHN Lv1Posted Nov-25-2025 14:16

Has anyone installed Sangfor and encountered this issue? How can it be fixed?”

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This error usually appears coz:

1. Secure Boot is still ON in the BIOS/UEFI
Sangfor uses a Linux kernel without a UEFI signature, so the boot loader rejects it.

2. The installer is corrupt / the ISO is damaged
The ISO file is incomplete, causing the kernel verification to fail.

3. Incorrect boot mode (UEFI should be changed to Legacy/CSM)
Some versions of Sangfor do not support UEFI boot.

#CMIIW
Is this answer helpful?
Sameena Jameel Lv1Posted Nov-26-2025 20:44
  
This error appears because the system is trying to load the Linux kernel with Secure Boot enabled, and the kernel signature is not accepted.

Step 1: Disable Secure Boot

Restart the system

Enter BIOS/UEFI (F2 / DEL / ESC)

Go to Security / Boot settings

Set Secure Boot = Disabled

Save & Exit

Step 2: Reboot the system

After disabling Secure Boot, the system will boot normally and Sangfor will work properly.

(If the issue still continues)

Change Boot Mode from UEFI - Legacy

Save and restart
Fitra Adi P Lv1Posted Dec-02-2025 09:25
  
This error usually appears coz:

1. Secure Boot is still ON in the BIOS/UEFI
Sangfor uses a Linux kernel without a UEFI signature, so the boot loader rejects it.

2. The installer is corrupt / the ISO is damaged
The ISO file is incomplete, causing the kernel verification to fail.

3. Incorrect boot mode (UEFI should be changed to Legacy/CSM)
Some versions of Sangfor do not support UEFI boot.

#CMIIW
Hendra Mustopa Lv1Posted Dec-02-2025 10:35
  
good answer

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