What are the potential solutions for fixing a 'error verification failed 0x1a security violation'?

The solutions often involve re-creating the Ventoy drive, verifying downloaded files, and correcting partition table permissions. If you have other bootloader software, temporarily disabling it might help. Using a different USB drive to create the Ventoy bootable media can also help determine if the issue is with the USB itself. In some cases, a BIOS/UEFI reset to factory defaults might be required, although this is a last resort.