I did install the kernel 4.12.14-lp150.202.g0985fc2 manually to test if console login issue was fixed.
Now installing kernel 4.12.14-lp150.12.45 will not activate it as default.
Default kernel in /boot is still
Since your KOTD has a higher version number it is not displaced as the “default” kernel to boot; you should find the last kernel installed under “Advanced options” in the GRUB menu.
Then if everything is OK you can manually uninstall the KOTD and the boot menu should rebuild accordingly.
The new kernel should show up in the Advanced submenu of your grub boot menu. Select and boot from that. And if it fixes your problems, then uninstall the KOTD kernel, as OrsoBruno suggests.