Linux freestylebook 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr 3 17:24:16 BST 2023 aarch64 The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. mainsail@freestylebook:~ $ apt-cache policy udev udev: Installed: 247.3-7+rpi1+deb11u1 Candidate: 247.3-7+rpi1+deb11u1 Version table: *** 247.3-7+rpi1+deb11u1 500 500 http://raspbian.raspberrypi.org/raspbian bullseye/main armhf Packages 100 /var/lib/dpkg/status mainsail@freestylebook:~ $ sudo apt edit-sources Select an editor. To change later, run 'select-editor'. 1. /bin/nano <---- easiest 2. /usr/bin/vim.tiny 3. /bin/ed Choose 1-3 [1]: 1 GNU nano 5.4 /etc/apt/sources.list deb http://raspbian.raspberrypi.org/raspbian/ bullseye main contrib non-fr> # Uncomment line below then 'apt-get update' to enable 'apt-get source' #deb-src http://raspbian.raspberrypi.org/raspbian/ bullseye main contrib n> deb http://ftp.debian.org/debian bullseye-backports main non-free contrib Linux freestylebook 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr 3 17:24:16 BST 2023 aarch64 The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. mainsail@freestylebook:~ $ apt-cache policy udev udev: Installed: 247.3-7+rpi1+deb11u1 Candidate: 247.3-7+rpi1+deb11u1 Version table: *** 247.3-7+rpi1+deb11u1 500 500 http://raspbian.raspberrypi.org/raspbian bullseye/main armhf Packages 100 /var/lib/dpkg/status mainsail@freestylebook:~ $ sudo apt edit-sources Select an editor. To change later, run 'select-editor'. 1. /bin/nano <---- easiest 2. /usr/bin/vim.tiny 3. /bin/ed Choose 1-3 [1]: 1 Your '/etc/apt/sources.list' file changed, please run 'apt-get update'. mainsail@freestylebook:~ $ sudo apt update Get:1 http://ftp.debian.org/debian bullseye-backports InRelease [49.0 kB] Get:2 http://raspbian.raspberrypi.org/raspbian bullseye InRelease [15.0 kB] Get:3 http://archive.raspberrypi.org/debian bullseye InRelease [23.6 kB] Err:1 http://ftp.debian.org/debian bullseye-backports InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131 Get:4 http://raspbian.raspberrypi.org/raspbian bullseye/main armhf Packages [13.2 MB] Get:5 http://archive.raspberrypi.org/debian bullseye/main armhf Packages [314 kB] Reading package lists... Done W: GPG error: http://ftp.debian.org/debian bullseye-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131 E: The repository 'http://ftp.debian.org/debian bullseye-backports 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. mainsail@freestylebook:~ $ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9 Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)). Executing: /tmp/apt-key-gpghome.MtQWCtsj7X/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9 gpg: key 73A4F27B8DD47936: public key "Debian Archive Automatic Signing Key (11/bullseye) " imported gpg: Total number processed: 1 gpg: imported: 1 mainsail@freestylebook:~ $ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6ED0E7B82643E131 Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)). Executing: /tmp/apt-key-gpghome.PmJK9S3epK/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 6ED0E7B82643E131 gpg: key B7C5D7D6350947F8: public key "Debian Archive Automatic Signing Key (12/bookworm) " imported gpg: Total number processed: 1 gpg: imported: 1 mainsail@freestylebook:~ $ sudo apt install udev -t bullseye-backports Reading package lists... Done E: The value 'bullseye-backports' is invalid for APT::Default-Release as such a release is not available in the sources mainsail@freestylebook:~ $