SOLVE Problem with TVH installation on ubuntu 14.04LTS

I'm trying in all the ways I read in the forum and in the various guides, but I can not install TVH in my ubuntu 14.04

i use this:
sudo apt install curl
curl http://apt.tvheadend.org/repo.gpg.key | sudo apt-key add -
sudo apt-add-repository -r http://apt.tvheadend.org/stable
sudo apt-add-repository http://apt.tvheadend.org/unstable
sudo apt update
sudo apt install tvheadend

I have also used this procedure but nothing has ever been the result

Hello,

The output of each command you posted will be helpful.

Regards.

thanks

W: GPG Error: http://apt.tvheadend.org trusty Release: The following signatures have not been verified because the public key is not available: NO_PUBKEY 89942AAE5CEAA174
W: Unable to retrieve http://apt.tvheadend.org/stable/dists/dists/trusty/main/binary-i386/Packages 404 Not Found [IP: 104.31.95.73 80]

E: Unable to download some index files: they will be ignored or the old ones will be used.

Try this before all:

apt-get install apt-transport-https dirmngr

Regards.

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Tvheadend