I successfully trained a few models on the Custom Translator portal which I cannot deploy. I tried several times, but each time I start the deployment I get a "Deploymentfailed" status after a while. 

Is there anything I should bear in mind or anything I can do about that?

Thanks
['https://Stackoverflow.com/questions/52700186', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/10472409/']
Quoting the [official backports documentation](https://backports.debian.org/Instructions/)

> 
> For jessie add this line
> 
> 
> 
> ```
> deb http://ftp.debian.org/debian jessie-backports main
> 
> ```
> 
> to your `sources.list` (or add a new file with the ".list" extension to
>  `/etc/apt/sources.list.d/`) You can also find a list of other mirrors at
>  <https://www.debian.org/mirror/list>
> 
> 
> For stretch add this line
> 
> 
> 
> ```
> deb http://ftp.debian.org/debian stretch-backports main
> 
> ```
> 
> to your `sources.list` (or add a new file with the ".list" extension to
>  `/etc/apt/sources.list.d/`) You can also find a list of other mirrors at
>  <https://www.debian.org/mirror/list>
> 
> 
> 

Now these instructions seem pretty clear (rather than "pretty vague"), that you should edit a file, rather than run a `deb` command.

(Probably the "your `sources.list` " could be changed to "your `/etc/apt/sources.list`")
Ok so I found out how this works and wanted to answer because I felt that the documentation I found was pretty vague so this is how you add Debian 9 stretch-backports to your sources.list:

* Manually, and with admin rights, navigate to /etc/apt/sources.list then create your stretch-backport.list file then enter it with nano, in my case I added this whole line:

```
deb http://ftp.debian.org/debian stretch-backports main

```

to this

```
 sudo nano /etc/apt/sources.list.d/stretch-backports.list

```

And it was that simple, I could then use the following line without any errors:

```
sudo apt-get install certbot -t stretch-backports

```

There it is! Hope I was clear.