I try install letsencrypt ssl to my server by this tutorial: https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-14-04 but I got the following errors:

W: Failed to fetch http://ppa.launchpad.net/ondrej/php5-5.6/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/ondrej/php5-5.6/ubuntu/dists/trusty/main/binary-i386/Packages  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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2 answers

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 The most common reason to see 404 errors when trying to install via apt is if your local package database is out of date.

@iambrose

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 "http://keyserver.ubuntu.com:11371/pks/lookup?op=get&search=0x4F4EA0AAE5267A6C"

I would then run:

apt-get update

… once again.

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