I can't update due to The repository 'http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 ./ Release' is not signed

Whenever I try to update terminal tells me this

Ign:20 ./ Release.gpg
Reading package lists... Done
W: GPG error: ./ Release: The following signatures were invalid: EXPKEYSIG 2F7F0DA5FD5B64B9 home:strycore OBS Project <home:>
E: The repository ' ./ Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

The answer here ' ./ Release' is not signed does not solve my problem.

2 Answers

The key is expired, you could try downloading it again.

wget -qO - | sudo apt-key add -
sudo apt-get update

I was able to resolve my problem by using cmd

curl | sudo apt-key add -
echo 'deb /' | sudo tee /etc/apt/sources.list.d/home:manuelschneid3r.list
sudo wget -nv -O "/etc/apt/trusted.gpg.d/home:manuelschneid3r.asc"
sudo apt update
sudo apt install albert