I have almost the same thing by getting back to the stock kernel:

these commands:

apt-get install --reinstall mp-fremantle-generic-pr
or
apt-get install --reinstall kernel kernel-flasher

will result in:

Reinstallation of mp-fremantle-generic-pr is not possoble, it cannot be downloaded
(same error for the second command but then with those packages names)

also apt-cache search does return mp-fremantle-generic-pr as a package.

What i did now is just flash to letho's stock kernel that i could download from his site. No idea what the real problem is why those commands dont work for me.
I have all repositories enabled (should i disable some?)

I have purged the titan packages . Still always the same error.