The newer Ubuntu kernel has the new retpoline Spectre mitigation. In
order to load, your kernel modules will need to be compiled with a
version of gcc that supports retpoline. You can determine if the module
has it with the command "modinfo " and look for the version
magic.
If you are using
Unfortunately I don't currently have a 14.04 installation so I don't
know which versions of gcc are available to you. I am using the package
"gcc-5" from the Xenial (16.04) repositories and it is working. You may
also want to check:
1. "which gcc"
a. Make sure this points to the version of gcc
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