Cinnamon 3.4.6
I've updated to kernel 4.13.0-26-generic. The update seemed to work with no issues. I re-started the computer and all was well (I have a dual boot box *Windows and Linux)), I got the menu asking me which OS I wanted to load. I choose Linux Mint 18.2. The system loaded and worked well.
Now the issue. I left the computer alone for several hours and when I came back the following screen was what I was presented with.

Before updating the kernel all I had to do was press the space bar and I would be presented with the logon screen. But after the kernel update when I press the space bar nothing happens at all. The computer is frozen. I have to hold the power button down until it tuns off. Then when I press the power button again the computer boots up normally.
Any ideas???