"exec format error" appears when docker runs homemade Ubuntu1604?

problem description

made a rootfs image of Ubuntu1604, and an error occurred during docker run: standard_init_linux.go:190: exec user process caused "exec format error" have you encountered such a problem? How to solve the problem

the environmental background of the problems and what methods you have tried

related codes

/ / Please paste the code text below (do not replace the code with pictures)

what result do you expect? What is the error message actually seen?

Apr.09,2021

there is a problem with the startup script.

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