Ubuntu – Ubuntu 16.04 – apt-get update – KEYEXPIRED

apt

I have this error on Ubuntu 16.04 when running apt-get update:

Err:15 
http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release.gpg
The following signatures were invalid: KEYEXPIRED 1496576244

And when I run:

apt-key list | grep expired

I get:

pub   2048R/BEB6D886 2015-03-27 [expired: 2017-06-04]

So I try to get the key:

sudo apt-key adv --recv-keys --keyserver keys.gnupg.net BEB6D886

And I get:

Executing: /tmp/tmp.oLjKJZ7zza/gpg.1.sh --recv-keys
--keyserver
keys.gnupg.net
BEB6D886
gpg: requesting key BEB6D886 from hkp server keys.gnupg.net
gpg: key BEB6D886: "home:Horst3180 OBS Project 
<home:Horst3180@build.opensuse.org>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1

So nothing has changed, and I still have the same error. Any clue ?

Best Answer

I have the exact same issue (I use Arc theme), and this is more of a workaround. Technically this error is not harmful because it only deprives you of updates of the related software (presumably Arc Theme by Horst3180).

Go to Settings > Software & Updates > Other Software and uncheck http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 like so (see fifth row):