Error keyexpired, Help me please!

[Emeilson]

Whenever I go to make update happens this error just below, and because I am new using the linux system I do not know what to do

W: Erro GPG: http://download.opensuse.org/repositori ... untu_16.04 Release: As seguintes assinaturas eram inválidas: KEYEXPIRED 1496576244
W: The repository 'http://download.opensuse.org/repositori ... untu_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.

[catweazel]

Whenever I go to make update happens this error just below, and because I am new using the linux system I do not know what to do

W: Erro GPG: http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release: As seguintes assinaturas eram inválidas: KEYEXPIRED 1496576244
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.


To be honest, if you use openSuse repositories, as you do, then you should expect problems even though they're allegedly for ubuntu 16.04. That said, it's something you need to sort out with the people who provide the repository.