When I try to update using apt-get update
give above error. I don't what causes this error, do you have any idea how can I fix this ?
W: GPG error:
http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04
Release: The following signatures couldn't be verified because the
public key is not available: NO_PUBKEY 5A7D1D38BEB6D886 W:The
repository
'http://download.opensuse.org/repositories/home:/Horst3180/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.
Best Answer
It seems that you need to visit corresponding software.opensuse.org OpenSuSe site and then follow instructions from it for the Ubuntu:
Also note that OpenSuse build service page for this repository is located on build.opensuse.org.