Letsencrypt/OpenSSL issue

I try install letsencrypt ssl to my server by this tutorial: but I got the following errors:

W: Failed to fetch  404  Not Found

W: Failed to fetch  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.
apt-get update hit problems but continuing anyway...
WARNING: The following packages cannot be authenticated!
libssl-dev openssl
E: There are problems and -y was used without --force-yes

Can you help me? How can I install openssl and after that the Letsencrypt? I currently using Ubuntu 14

Cheers, Brose

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How did you add Ondřej Surý PHP repository? Did you use a command such as the one below?

sudo add-apt-repository ppa:ondrej/php

After adding his repo you’d need to run apt-get update. You may also want to make sure that you have his signing key installed on your server as the follow suggests that it doesn’t exist:

WARNING: The following packages cannot be authenticated!

You can add his key by running:

apt-key adv --fetch-keys ""

I would then run:

apt-get update

… once again.

Did you ensure that you ran apt-get update before attempting the install. The most common reason to see 404 errors when trying to install via apt is if your local package database is out of date.