Install bitcoin core on debian jessie error

I have to install bitcoin core to use op_return library. But I have difficulties to install correctly bitcoin core.

First I run the command :sudo apt-add-repository ppa:bitcoin/bitcoin

Second I enter this command: apt-get update

But I have error : Err http:/ppa.launchpad.net jessie/main amd64 Packages (<- there is two “/” but I can’t write this beause I don”t have enough reputation)

Err http:/ppa.launchpad.net jessie/main amd64 Packages

Err http:/ppa.launchpad.net jessie/main amd64 Packages

Err http:/ppa.launchpad.net jessie/main amd64 Packages

Err http:/ppa.launchpad.net jessie/main amd64 Packages
404 Not Found

W: Failed to fetch http:/ppa.launchpad.net/bitcoin/bitcoin/ubuntu/dists/jessie/main/binary-amd64/Packages 404 Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

So when I want to do this : apt-get install bitcoin-qt I have : E: Unable to locate package bitcoin-qt

What can I do?

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