I was already on 16.04, made an update and now I have login issues, it is looping. Is there any file I can look for crash log or anything that I could try?
Already tried everything on post Ubuntu gets stuck in a login loop and still not working. My screen resolution is also wrong now so maybe it has relation with video card.
If you have a nvidia card, everytime you have an upgrade for some reason I still don't know why, it is deleting the driver. So how I fixed it: downloading and installing the driver once more.
For nvidia users:
ctrl+alt+f1 and do the login, then
sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt update
sudo apt-get nvidia-370 (370 in my case, may change)