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I need to use a new Kernel to test some features (with systemtap). Ubuntu doesn't have a recent 4.15 Kernel in the repos. I have downloaded the source code from kernel.org I have compiled a new kernel on Ubuntu 16 by hand.

After installing and rebooting I get the following output:

$ uname -r
4.15.12

However when I run stap-prep I get the following output:

bensley@ubuntu16:~$ sudo stap-prep 
[sudo] password for bensley: 
cut: /proc/version_signature: No such file or directory
dpkg: error: --compare-versions takes three arguments: <version> <relation> <version>

Type dpkg --help for help about installing and deinstalling packages [*];
Use 'apt' or 'aptitude' for user-friendly package management;
Type dpkg -Dhelp for a list of dpkg debug flag values;
Type dpkg --force-help for a list of forcing options;
Type dpkg-deb --help for help about manipulating *.deb files;

Options marked [*] produce a lot of output - pipe it through 'less' or 'more' !
Package linux-image-4.15.12 version 4.15.12-3 does not match version of currently running kernel: 
 Consider apt-get upgrade && reboot
Please install linux-headers-4.15.12
You need package linux-image-4.15.12-dbgsym but it does not seem to be available
 Ubuntu -dbgsym packages are typically in a separate repository
 Follow https://wiki.ubuntu.com/DebuggingProgramCrash to add this repository

There seems to be a slight difference between version number on the files that were built and the Kernel version. The Kernel shows as 4.15.12 but the linux-headers and linux-image files say they are minor/sub-revision different 4.15.123 (note the extra "3"):

bensley@ubuntu16:~$ apt show linux-headers-4.15.12
Package: linux-headers-4.15.123
Version: 4.15.123-4
Status: install ok installed
Priority: optional
Section: kernel
Source: linux-4.15.123
Maintainer: Anonymous <root@ubuntu16>
Installed-Size: 79.0 MB
Homepage: http://www.kernel.org/
Download-Size: unknown
APT-Manual-Installed: yes
APT-Sources: /var/lib/dpkg/status
Description: Linux kernel headers for 4.15.123 on amd64
 This package provides kernel header files for 4.15.123 on amd64
 .
 This is useful for people who need to build external modules

As per the stap-prep message above Package linux-image-4.15.12 version 4.15.12-3 does not match version of currently running kernel. How can I resolve this? I have downloaded 4.15.12 source and installed that but the version number in the .deb packages that were built are 4.15.12-3.

These files were produced and successfully installed when I compiled the Kernel and ran sudo dpkg -i *.deb:

linux-headers-4.15.12_4.15.12-3_amd64.deb

linux-libc-dev_4.15.12-3_amd64.deb

linux-image-4.15.12_4.15.12-3_amd64.deb

linux-image-4.15.12-dbg_4.15.12-3_amd64.deb