osmc@osmc:~$ sudo apt-get update
Get:1 http://apt.tvheadend.org wheezy InRelease [4448 B]
Hit http://staging.apt.osmc.tv jessie InRelease
Ign http://apt.tvheadend.org wheezy InRelease
Ign http://apt.tvheadend.org wheezy/main armhf Packages/DiffIndex
Get:2 http://apt.tvheadend.org wheezy/main armhf Packages [871 B]
Ign http://apt.tvheadend.org wheezy/main Translation-en
Get:3 http://staging.apt.osmc.tv jessie/main armhf Packages/DiffIndex [2023 B]
Ign http://staging.apt.osmc.tv jessie/main Translation-en
Err http://mirrordirector.raspbian.org jessie InRelease

Err http://mirrordirector.raspbian.org jessie Release.gpg
  Unable to connect to mirrordirector.raspbian.org:http:
Fetched 6471 B in 2min 0s (53 B/s)
Reading package lists... Done
W: GPG error: http://apt.tvheadend.org wheezy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B42317285E12C7CF
W: Failed to fetch http://mirrordirector.raspbian.org/raspbian/dists/jessie/InRelease

W: Failed to fetch http://mirrordirector.raspbian.org/raspbian/dists/jessie/Release.gpg  Unable to connect to mirrordirector.raspbian.org:http:

W: Some index files failed to download. They have been ignored, or old ones used instead.
osmc@osmc:~$ sudo apt-get install hts-tvheadend
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package hts-tvheadend is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  tvheadend

E: Package 'hts-tvheadend' has no installation candidate
osmc@osmc:~$