Error while booting with flashdisk

[mahesh]

Hi all;
Today i tried to install Ubuntu 21.10 Imprish to my Asus Vivobook X1502ZA for testing. Just created a bootable flashdisk with Universal USB installer so far so good. When I boot from flashdisk taking this error:"Error verification failed (0x1A) security violation" But also tested with LTS bootable flashdisk this is not stopping the process and correctly booting. What would be this error mean. I would be much appreciated.
alex