Lambda Quad: Login loop. I can’t log in, but I’m entering correct password

post by sabalaba on Dec 21, 2017

If you’re stuck at this screen and every time you attempt to sign in, Ubuntu pauses for a moment, then acts as if you’d typed the wrong password, you’re in a “login loop.” There are a few potential solutions to this issue:

SOLUTION #1: REINSTALL NVIDIA DRIVERS
The easiest way to do this is to reinstall Lambda Stack, which includes NVIDIA’s GPU driver. At the login screen you’re stuck on, press CTRL+Alt+F1; this will open up a terminal. Now, enter the following command:

LAMBDA_REPO=$(mktemp) && 
wget -O${LAMBDA_REPO} https://lambdal.com/static/files/lambda-stack-repo.deb && 
sudo dpkg -i ${LAMBDA_REPO} && rm -f ${LAMBDA_REPO} && 
sudo apt-get update && sudo apt-get install -y lambda-stack-cuda

Now, reboot the machine.

SOLUTION #2: DISABLE SECURE BOOT
This is a UEFI (replacement for BIOS) setting that breaks NVIDIA’s GPU drivers. Follow instructions here to disable Secure Boot. You should now be able to log in.

post by Sagubaja on Jan 4, 2018

Im having the sme truble with the tensorBook but it doesnt work, can tou please help me

post by sabalaba on Jan 4, 2018

What is the contents of the error file, can you please post a screenshot here of this command’s output?

cat /var/log/nvidia-installer.log

post by Sagubaja on Jan 5, 2018

Here is what pops up when i enter the comand

post by Sagubaja on Jan 8, 2018

Can you Gide me to fix this, I haven’t been able to use my tensor book at all

post by sabalaba on Jan 9, 2018

Hi Sagubaja, we’ve sent you an email from our official support team who will be looking into this for you!

post by dkermany on Jan 16, 2018

Hello,

I have a Lambda Quad and this fix does not work for me. There appears to be an error during driver installation. Error log attached below.

post by sabalaba on Jan 16, 2018

Hey! Can you try installing from the public repos instead:

LAMBDA_REPO=$(mktemp) && 
wget -O${LAMBDA_REPO} https://lambdal.com/static/files/lambda-stack-repo.deb && 
sudo dpkg -i ${LAMBDA_REPO} && rm -f ${LAMBDA_REPO} && 
sudo apt-get update && sudo apt-get install -y lambda-stack-cuda

Let me know if that helps @dkermany

post by dkermany on Jan 16, 2018

That did the trick. Thanks!