@PAVAMAN: Is there a reason that you installed the modules and modules-extra packages using 'dpkg -i' and then tried to install the kernel using 'apt-get install'? It doesn't look like you installed the right kernel there.
I think the third command should have been 'dpkg -i linux-image-unsigned-4.15.0-45-generic_4.15.0-45.48~16.04.1_ppc64el.deb'
Please try to install the kernel that way and retry the test. Thanks
@PAVAMAN: Is there a reason that you installed the modules and modules-extra packages using 'dpkg -i' and then tried to install the kernel using 'apt-get install'? It doesn't look like you installed the right kernel there. unsigned- 4.15.0- 45-generic_ 4.15.0- 45.48~16. 04.1_ppc64el. deb'
I think the third command should have been 'dpkg -i linux-image-
Please try to install the kernel that way and retry the test. Thanks