# How to fix su: Authentication failure

It's already Friday, and I'm delighted 😉 to see you here.

Another day of problem-solving, so we'll see how it goes.

## Issue

``` 
su: Authentication failure

```

This issue is encountered when trying to `su` to root.

## Fix

Use `sudo` to become root:

```
sudo -i

``` 

`su` fails with an authentication problem since the root account is blocked by default in Ubuntu, and there is no root password.

That's it 🥳🥳🥳



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