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For perhaps the last month I have had problems sometimes logging into my Ubuntu after updates. But I would shut down the computer and restart until I could successfully login, and that worked for me. After the Wednesday [1-11-2017] update, I could no longer login. When I pressed CTRL + ALT + F1, one of the lines of text said

"nouveau 0000:01:00.0: DRM: GPU lock-up - switching to software fbcon"

When I tried to login, the text console said "login incorrect"

Thankfully, I was able to login after I went into Recovery Mode.

However, I still cannot login to my Ubuntu 16.04 LTS unless I enter Recovery Mode.

(In November, 2015 my son bought a new hard-drive and installed my Ubuntu on an old Gateway computer. I don't know if that makes any difference or not. I'm not sure where we got the graphics card.)

I like Ubuntu, but why could I login fine and then after an update not be able to login ?

Bill Schell
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2 Answers2

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Problem Solved :) I went to the website for the Canonical Group's "Graphic Drivers" team. The driver they recommended for my GeForce 8600 was the proprietary "nvidia-340"(340.98).

I clicked on the "System Settings" icon on the left side of my computer screen, then I clicked "Software and Updates", then "Additional Drivers".

Ubuntu automatically searched for a list of available drivers. I chose the recommended driver and pressed the button to install. Ubuntu automatically installed the driver.

Everything is good again. (At least for now.) I can log-in to my computer no problem. After three days and many hours of frustration and despair, it was almost too easy :)

Bill Schell
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I'm not sure if this will help you somehow, but for general case it might work.

While you are in the recovery mode you can check list of existing users

cut -d: -f1 /etc/passwd

Then, if your user exists, assuming that only the password has changed, you can attempt to change it back using:

passwd [your username here]
Jacajack
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