Comment 5 for bug 1757937

For the GCP kernel, yes it's missing the linux-image-extra-4.13.0-1012-gcp package, this issue will gone with that package installed.

However as this package was not installed by default (when the instance got deployed), we had a similar issue for aufs.ko for s390x before:
https://lists.ubuntu.com/archives/kernel-team/2017-March/082978.html

This can be fixed from the test suite or just doing the same thing above.

For the AWS kernel, there is no extra package available.
$ apt-cache search extra| grep linux
linux-image-extra-4.15.0-1001-gcp - Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
linux-image-extra-4.15.0-1002-azure - Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
linux-image-extra-4.15.0-13-generic - Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
linux-image-extra-virtual - Extra drivers for Virtual Linux kernel image
ganglia-modules-linux - Ganglia extra modules for Linux (IO, filesystems, multicpu)
linux-image-extra-4.15.0-1003-azure - Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP