root@malefic:~# apt-get -o debug::pkgproblemresolver=1 install linux-image-generic-lts-yakkety linux-signed-generic-lts-yakkety 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Starting pkgProblemResolver with broken count: 2
Starting 2 pkgProblemResolver with broken count: 2
Investigating (0) linux-image-generic-lts-yakkety [ amd64 ] < none -> 4.8.0.9.1 > ( kernel )
Broken linux-image-generic-lts-yakkety:amd64 Depends on linux-image-4.8.0-9-generic [ amd64 ] < none > ( none )
Broken linux-image-generic-lts-yakkety:amd64 Depends on linux-image-extra-4.8.0-9-generic [ amd64 ] < none > ( none )
Investigating (0) linux-signed-generic-lts-yakkety [ amd64 ] < none -> 4.8.0.9.1 > ( kernel )
Broken linux-signed-generic-lts-yakkety:amd64 Depends on linux-signed-image-generic-lts-yakkety [ amd64 ] < none -> 4.8.0.9.1 > ( kernel ) (= 4.8.0.9.1)
  Considering linux-signed-image-generic-lts-yakkety:amd64 0 as a solution to linux-signed-generic-lts-yakkety:amd64 9999
    Reinst Failed early because of linux-signed-image-4.8.0-9-generic:amd64
Broken linux-signed-generic-lts-yakkety:amd64 Depends on linux-headers-generic-lts-yakkety [ amd64 ] < none -> 4.8.0.9.1 > ( kernel ) (= 4.8.0.9.1)
  Considering linux-headers-generic-lts-yakkety:amd64 0 as a solution to linux-signed-generic-lts-yakkety:amd64 9999
    Reinst Failed early because of linux-headers-4.8.0-9-generic:amd64
Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
 linux-image-generic-lts-yakkety : Depends: linux-image-4.8.0-9-generic but it is not installable
                                   Depends: linux-image-extra-4.8.0-9-generic but it is not installable
 linux-signed-generic-lts-yakkety : Depends: linux-signed-image-generic-lts-yakkety (= 4.8.0.9.1) but it is not going to be installed
                                    Depends: linux-headers-generic-lts-yakkety (= 4.8.0.9.1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
root@malefic:~# apt-get install linux-image-4.8.0-9-generic
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package linux-image-4.8.0-9-generic is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'linux-image-4.8.0-9-generic' has no installation candidate
root@malefic:~#