Ign:1 http://ftp.debian.org/debian stretch InRelease
Get:2 http://ftp.debian.org/debian stretch-updates InRelease [91.0 kB]
Get:3 http://security.debian.org stretch/updates InRelease [94.3 kB]
Get:4 http://ftp.debian.org/debian stretch Release [118 kB]
Get:5 http://ftp.debian.org/debian stretch Release.gpg [2434 B]
Get:6 https://apt.syncthing.net syncthing InRelease [15.1 kB]
Get:7 http://download.mono-project.com/repo/debian raspbianjessie InRelease [2222 B]
Err:2 http://ftp.debian.org/debian stretch-updates InRelease
  Unknown error executing apt-key
Get:8 http://ppa.launchpad.net/webupd8team/java/ubuntu trusty InRelease [15.5 kB]
Get:10 http://apt.sonarr.tv master InRelease [13.3 kB]
Ign:11 http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu cosmic InRelease
Err:12 http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu cosmic Release
  404  Not Found
Ign:13 http://download.opensuse.org/repositories/home:/emby/xUbuntu_14.04  InRelease
Get:14 https://packages.sury.org/php jessie InRelease [6915 B]
Get:15 http://download.opensuse.org/repositories/home:/emby/xUbuntu_14.04  Release [1021 B]
Get:16 http://download.opensuse.org/repositories/home:/emby/xUbuntu_14.04  Release.gpg [481 B]
0% [3 InRelease gpgv 94.3 kB]
Err:3 http://security.debian.org stretch/updates InRelease
  Unknown error executing apt-key
Ign:5 http://ftp.debian.org/debian stretch Release.gpg
Err:6 https://apt.syncthing.net syncthing InRelease
  Unknown error executing apt-key
Err:7 http://download.mono-project.com/repo/debian raspbianjessie InRelease
  Unknown error executing apt-key
Err:10 http://apt.sonarr.tv master InRelease
  Unknown error executing apt-key
Get:17 https://deb.nodesource.com/node_6.x jessie InRelease [4634 B]
Get:18 https://dev2day.de/pms jessie InRelease [1803 B]
Err:8 http://ppa.launchpad.net/webupd8team/java/ubuntu trusty InRelease
  Unknown error executing apt-key
Get:9 http://ftp.fau.de/osmc/osmc/apt stretch InRelease [4664 B]
Err:14 https://packages.sury.org/php jessie InRelease
  Unknown error executing apt-key
Ign:16 http://download.opensuse.org/repositories/home:/emby/xUbuntu_14.04  Release.gpg
Err:17 https://deb.nodesource.com/node_6.x jessie InRelease
  Unknown error executing apt-key
Err:18 https://dev2day.de/pms jessie InRelease
  Unknown error executing apt-key
Err:9 http://ftp.fau.de/osmc/osmc/apt stretch InRelease
  Unknown error executing apt-key
Reading package lists... Done
W: GPG error: http://ftp.debian.org/debian stretch-updates InRelease: Unknown error executing apt-key
E: The repository 'http://ftp.debian.org/debian stretch-updates InRelease' 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.
E: The repository 'http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu cosmic Release' does not have a Release file.
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.
W: GPG error: http://security.debian.org stretch/updates InRelease: Unknown error executing apt-key
E: The repository 'http://security.debian.org stretch/updates InRelease' 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.
W: GPG error: http://ftp.debian.org/debian stretch Release: Unknown error executing apt-key
E: The repository 'http://ftp.debian.org/debian stretch 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.
W: GPG error: https://apt.syncthing.net syncthing InRelease: Unknown error executing apt-key
E: The repository 'https://apt.syncthing.net syncthing InRelease' 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.
W: GPG error: http://download.mono-project.com/repo/debian raspbianjessie InRelease: Unknown error executing apt-key
E: The repository 'http://download.mono-project.com/repo/debian raspbianjessie InRelease' 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.
W: GPG error: http://apt.sonarr.tv master InRelease: Unknown error executing apt-key
E: The repository 'http://apt.sonarr.tv master InRelease' 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.
W: GPG error: http://ppa.launchpad.net/webupd8team/java/ubuntu trusty InRelease: Unknown error executing apt-key
E: The repository 'http://ppa.launchpad.net/webupd8team/java/ubuntu trusty InRelease' 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.
W: GPG error: https://packages.sury.org/php jessie InRelease: Unknown error executing apt-key
E: The repository 'https://packages.sury.org/php jessie InRelease' 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.
W: GPG error: http://download.opensuse.org/repositories/home:/emby/xUbuntu_14.04  Release: Unknown error executing apt-key
E: The repository 'http://download.opensuse.org/repositories/home:/emby/xUbuntu_14.04  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.
W: GPG error: https://deb.nodesource.com/node_6.x jessie InRelease: Unknown error executing apt-key
E: The repository 'https://deb.nodesource.com/node_6.x jessie InRelease' 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.
W: GPG error: https://dev2day.de/pms jessie InRelease: Unknown error executing apt-key
E: The repository 'https://dev2day.de/pms jessie InRelease' 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.
W: GPG error: http://ftp.fau.de/osmc/osmc/apt stretch InRelease: Unknown error executing apt-key
E: The repository 'http://apt.osmc.tv stretch InRelease' 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.