Insmod prompt invalid module format

Report errors

Error when installing kernel module

$ sudo insmod hello.ko
insmod: ERROR: could not insert module hello.ko: Invalid module format

solve

The reason is that the version of the kernel header file used for compilation is inconsistent with the running kernel version
Try make clean & make
If not yet , Probably /usr/src/linux-headers-$(uname -r) The directory is polluted , Try uninstalling and installing

sudo apt-get remove linux-headers-$(uname -r)
sudo apt-get install linux-headers-$(uname -r)

And then again make clean & make, Just fine