tvheadend is a tv server which I use for my DVB-S receiver, a TT-connect S2-3650 CI. These are my notes to install tvheadend, which are not included in the standard repository.
If you got the following error, you have add the repository found on some links in the net. Mostly they are wrong.
<font 10px/inherit;;inherit;;inherit>W: Failed to fetch https://dl.bintray.com/tvheadend/deb/dists/jessie/Release Unable to find expected entry 'unstable/binary-armhf/Packages' in Release file (Wrong sources.list entry or malformed file) E: Some index files failed to download. They have been ignored, or old ones used instead.</font>
This is the right line to add to /etc/apt/sources.list if you use Raspian / Debian 8 “Jessie”.
deb http://dl.bintray.com/tvheadend/deb/ jessie release