Here is the output
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/home/user # apt-get install --reinstall -y kernel kernel-flasher
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
file libmagic1
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 2 reinstalled, 0 to remove and 6 not upgraded.
Need to get 2046kB of archives.
After this operation, 0B of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
kernel-flasher kernel
E: There are problems and -y was used without --force-yes
/home/user #