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libmono-system-security4.0-cil fails update - unauthenticated packages - Ubuntu 16.04


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 libmono-system-security4.0-cil fails update - unauthenticated packages

after apt-get update I get the following error.


Any ideas ?

user@ubuntu-server:~$ sudo apt-get update
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:2 http://ca.archive.ubuntu.com/ubuntu xenial InRelease
Get:3 http://ca.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Ign:4 http://download.opensuse.org/repositories/home:/emby/xUbuntu_16.04  InRelease
Get:5 http://ca.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Get:6 http://download.opensuse.org/repositories/home:/emby/xUbuntu_16.04  Release [1,009 B]
Get:7 http://download.opensuse.org/repositories/home:/emby/xUbuntu_16.04  Release.gpg [481 B]
Ign:8 http://download.opensuse.org/repositories/home:/emby/xUbuntu_16.04  Release.gpg
Hit:9 http://download.opensuse.org/repositories/home:/emby/xUbuntu_16.04  Packages
Fetched 308 kB in 0s (391 kB/s)
Reading package lists... Done
W: GPG error: http://download.opensuse.org/repositories/home:/emby/xUbuntu_16.04  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0A506F712A7D8A28
W: The repository 'http://download.opensuse.org/repositories/home:/emby/xUbuntu_16.04  Release' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
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