# Trying to find TF version and getting “Invalid MIT-MAGIC-COOKIE-1…”

## post by votbod on Aug 2, 2020

completely new tensorbook with ubuntu. opened terminal. ran python -c ‘import tensorflow as tf; print(tf. **version**)’ and got Invalid MIT-MAGIC-COOKIE-1 key2.2.0. Why didn’t the command work?

## post by jeremy on Aug 5, 2020

That’s interesting. I usually only see those error messages when using Tensorflow over SSH.

For whatever reason, Tensorflow 2 attempts to open an X window. When it fails, it may print an error message like that.

Is this happening over SSH or just in your local terminal?

## post by votbod on Aug 6, 2020

local terminal but is that command in some way making it think its a remote client?

## post by jeremy on Sep 2, 2020

It seems that the _Invalid MIT-MAGIC-COOKIE-1 key_ message doesn’t pop up at all when using `lightdm`.

To switch to `lightdm`, run:

```bash

sudo apt -y install lightdm
```

Once that installs, run the following, and select `lightdm`:

```bash

sudo dpkg-reconfigure lightdm
```

Then reboot.

## post by fkx on Apr 15, 2021

ok, what is lightdm and why does it work and why isn’t installed? (just curious)