Raspbian – Fixing broken sources

Quick one here: I was getting an issue the installing packages on Raspbian which I can easily occur elsewhere. This was a very sore, abused, and then neglected Raspberry Pi!

[email protected] ~ $ sudo apt-get update
Ign:1 http://deb.debian.org/debian stretch InRelease
Get:2 http://deb.debian.org/debian-security stretch/updates InRelease [94.3 kB]
Get:3 http://deb.debian.org/debian stretch-updates InRelease [91.0 kB]
Get:4 http://deb.debian.org/debian stretch Release [118 kB]
Ign:2 http://deb.debian.org/debian-security stretch/updates InRelease
Get:5 http://deb.debian.org/debian stretch Release.gpg [2,434 B]
Get:6 http://deb.debian.org/debian-security stretch/updates/main Sources [179 kB]
Ign:3 http://deb.debian.org/debian stretch-updates InRelease
Get:7 http://deb.debian.org/debian-security stretch/updates/main armhf Packages [432 kB]
Get:8 http://deb.debian.org/debian-security stretch/updates/main Translation-en [192 kB]
Get:9 http://deb.debian.org/debian stretch-updates/main Sources [3,752 B]
Ign:5 http://deb.debian.org/debian stretch Release.gpg
Get:10 http://deb.debian.org/debian stretch-updates/main armhf Packages [5,112 B]
Get:11 http://deb.debian.org/debian stretch-updates/main Translation-en [4,512 B]
Get:12 http://deb.debian.org/debian stretch/main Sources [6,758 kB]
Get:13 http://deb.debian.org/debian stretch/main armhf Packages [6,927 kB]
Get:14 http://deb.debian.org/debian stretch/main Translation-en [5,393 kB]
Fetched 20.2 MB in 49s (411 kB/s)
Reading package lists... Done
W: Unable to read /etc/apt/apt.conf.d/ - DirectoryExists (2: No such file or directory)
W: GPG error: http://deb.debian.org/debian-security stretch/updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9D6D8F6BC857C906 NO_PUBKEY 8B48AD6246925553
W: The repository 'http://deb.debian.org/debian-security stretch/updates InRelease' 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.
W: GPG error: http://deb.debian.org/debian stretch-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010
W: The repository 'http://deb.debian.org/debian stretch-updates InRelease' 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.
W: GPG error: http://deb.debian.org/debian stretch Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 NO_PUBKEY EF0F382A1A7B6500
W: The repository 'http://deb.debian.org/debian stretch 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.

I just needed to add the correct keys for each that did not have a correct key.

[email protected] ~ $ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EF0F382A1A7B6500
Executing: /tmp/apt-key-gpghome.cYHo45LmGV/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys EF0F382A1A7B6500
gpg: key EF0F382A1A7B6500: public key "Debian Stable Release Key (9/stretch) " imported
gpg: Total number processed: 1
gpg:               imported: 1

And to update:

[email protected] ~ $ sudo apt-get update
Ign:1 http://deb.debian.org/debian stretch InRelease
Get:2 http://deb.debian.org/debian-security stretch/updates InRelease [94.3 kB]
Get:3 http://deb.debian.org/debian stretch-updates InRelease [91.0 kB]
Hit:4 http://deb.debian.org/debian stretch Release
Get:5 http://deb.debian.org/debian stretch Release.gpg [2,434 B]
Fetched 188 kB in 3s (51.0 kB/s)
Reading package lists... Done

Much nicer!