schwim@schwim-vm-bl:~$ sudo apt-get update
Ign http://dl.google.com stable InRelease
Ign http://ftp.us.debian.org jessie InRelease
Get:1 http://security.debian.org jessie/updates InRelease [63.1 kB]
Get:2 http://dl.google.com stable Release.gpg [916 B]
Get:3 http://ftp.us.debian.org jessie-updates InRelease [142 kB]
Get:4 http://dl.google.com stable Release [1,189 B]
Hit http://ftp.us.debian.org jessie Release.gpg
Get:5 http://dl.google.com stable/main amd64 Packages [1,349 B]
Hit http://ftp.us.debian.org jessie Release
Get:6 http://security.debian.org jessie/updates/main amd64 Packages [287 kB]
Ign http://mega.nz ./ InRelease
Get:7 http://ftp.us.debian.org jessie-updates/main amd64 Packages/DiffIndex [4,948 B]
Get:8 http://pkg.bunsenlabs.org bunsen-hydrogen InRelease [5,153 B]
Get:9 http://ftp.us.debian.org jessie-updates/contrib amd64 Packages [32 B]
Err http://pkg.bunsenlabs.org bunsen-hydrogen InRelease

Get:10 http://ftp.us.debian.org jessie-updates/non-free amd64 Packages/DiffIndex [736 B]
Get:11 http://ftp.us.debian.org jessie-updates/contrib Translation-en [14 B]
Get:12 http://ftp.us.debian.org jessie-updates/main Translation-en/DiffIndex [2,704 B]
Get:13 http://security.debian.org jessie/updates/contrib amd64 Packages [2,506 B]
Get:14 http://security.debian.org jessie/updates/non-free amd64 Packages [14 B]
Ign http://repo.vivaldi.com stable InRelease
Get:15 http://repo.vivaldi.com stable Release.gpg [819 B]
Get:16 http://security.debian.org jessie/updates/contrib Translation-en [1,211 B]
Get:17 http://repo.vivaldi.com stable Release [2,709 B]
Get:18 http://ftp.us.debian.org jessie-updates/non-free Translation-en/DiffIndex [736 B]
Get:19 http://repo.vivaldi.com stable/main amd64 Packages [2,711 B]
Hit http://ftp.us.debian.org jessie/main amd64 Packages
Hit http://ftp.us.debian.org jessie/main Translation-en
Get:20 http://security.debian.org jessie/updates/main Translation-en [145 kB]
Get:21 http://security.debian.org jessie/updates/non-free Translation-en [14 B]
Get:22 http://mega.nz ./ Release.gpg [481 B]
Get:23 http://mega.nz ./ Release [977 B]
Hit http://www.deb-multimedia.org jessie InRelease
Get:24 http://mega.nz ./ Packages [1,261 B]
Hit http://www.deb-multimedia.org jessie/main amd64 Packages
Hit http://www.deb-multimedia.org jessie/non-free amd64 Packages
Ign http://dl.google.com stable/main Translation-en_US
Ign http://dl.google.com stable/main Translation-en
Ign http://mega.nz ./ Translation-en_US
Ign http://mega.nz ./ Translation-en
Ign http://www.deb-multimedia.org jessie/main Translation-en_US
Ign http://www.deb-multimedia.org jessie/main Translation-en
Ign http://repo.vivaldi.com stable/main Translation-en_US
Ign http://www.deb-multimedia.org jessie/non-free Translation-en_US
Ign http://www.deb-multimedia.org jessie/non-free Translation-en
Ign http://repo.vivaldi.com stable/main Translation-en
Fetched 668 kB in 3s (205 kB/s)
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://pkg.bunsenlabs.org bunsen-hydrogen InRelease: The following signatures were invalid: KEYEXPIRED 1468162041 KEYEXPIRED 1468162041 KEYEXPIRED 1468162041

W: Failed to fetch http://pkg.bunsenlabs.org/debian/dists/bunsen-hydrogen/InRelease

W: Some index files failed to download. They have been ignored, or old ones used instead.
schwim@schwim-vm-bl:~$ sudo apt-get --allow-unauthenticated install bunsen-keyring
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package bunsen-keyring
schwim@schwim-vm-bl:~$ sudo apt-get update
Hit http://security.debian.org jessie/updates InRelease
Ign http://ftp.us.debian.org jessie InRelease
Ign http://dl.google.com stable InRelease
Hit http://ftp.us.debian.org jessie-updates InRelease
Hit http://dl.google.com stable Release.gpg
Hit http://ftp.us.debian.org jessie Release.gpg
Hit http://dl.google.com stable Release
Get:1 http://ftp.us.debian.org jessie-updates/main amd64 Packages/DiffIndex [4,948 B]
Hit http://security.debian.org jessie/updates/main amd64 Packages
Hit http://security.debian.org jessie/updates/contrib amd64 Packages
Hit http://security.debian.org jessie/updates/non-free amd64 Packages
Hit http://security.debian.org jessie/updates/contrib Translation-en
Hit http://security.debian.org jessie/updates/main Translation-en
Hit http://security.debian.org jessie/updates/non-free Translation-en
Get:2 http://ftp.us.debian.org jessie-updates/non-free amd64 Packages/DiffIndex [736 B]
Ign http://mega.nz ./ InRelease
Get:3 http://pkg.bunsenlabs.org bunsen-hydrogen InRelease [5,153 B]
Hit http://dl.google.com stable/main amd64 Packages
Err http://pkg.bunsenlabs.org bunsen-hydrogen InRelease

Get:4 http://ftp.us.debian.org jessie-updates/main Translation-en/DiffIndex [2,704 B]
Ign http://repo.vivaldi.com stable InRelease
Get:5 http://ftp.us.debian.org jessie-updates/non-free Translation-en/DiffIndex [736 B]
Hit http://repo.vivaldi.com stable Release.gpg
Hit http://repo.vivaldi.com stable Release
Get:6 http://repo.vivaldi.com stable/main amd64 Packages [2,711 B]
Hit http://ftp.us.debian.org jessie Release
Hit http://ftp.us.debian.org jessie-updates/contrib amd64 Packages
Hit http://ftp.us.debian.org jessie-updates/contrib Translation-en
Get:7 http://mega.nz ./ Release.gpg [481 B]
Ign http://dl.google.com stable/main Translation-en_US
Ign http://dl.google.com stable/main Translation-en
Hit http://ftp.us.debian.org jessie/main amd64 Packages
Hit http://ftp.us.debian.org jessie/main Translation-en
Get:8 http://mega.nz ./ Release [977 B]
Hit http://www.deb-multimedia.org jessie InRelease
Get:9 http://mega.nz ./ Packages [1,261 B]
Hit http://www.deb-multimedia.org jessie/main amd64 Packages
Hit http://www.deb-multimedia.org jessie/non-free amd64 Packages
Ign http://mega.nz ./ Translation-en_US
Ign http://repo.vivaldi.com stable/main Translation-en_US
Ign http://mega.nz ./ Translation-en
Ign http://www.deb-multimedia.org jessie/main Translation-en_US
Ign http://repo.vivaldi.com stable/main Translation-en
Ign http://www.deb-multimedia.org jessie/main Translation-en
Ign http://www.deb-multimedia.org jessie/non-free Translation-en_US
Ign http://www.deb-multimedia.org jessie/non-free Translation-en
Fetched 11.8 kB in 3s (3,494 B/s)
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://pkg.bunsenlabs.org bunsen-hydrogen InRelease: The following signatures were invalid: KEYEXPIRED 1468162041 KEYEXPIRED 1468162041 KEYEXPIRED 1468162041

W: Failed to fetch http://pkg.bunsenlabs.org/debian/dists/bunsen-hydrogen/InRelease

W: Some index files failed to download. They have been ignored, or old ones used instead.
schwim@schwim-vm-bl:~$ sudo apt-get --allow-unauthenticated install bunsen-keyring
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package bunsen-keyring
schwim@schwim-vm-bl:~$