If you want to use stretch-backports on a Raspberry Pi you can't easily because the Raspberry Pi foundation don't have a repository for it. You can, if you have a Pi2 or Pi3, use the standard Debian repository.
To add the Debian Stretch repository type the following commands into a terminal window or ssh into your Pi and type them in:
sudo apt install dirmngr
gpg --keyserver pgpkeys.mit.edu --recv-key 8B48AD6246925553
gpg -a --export 8B48AD6246925553 | sudo apt-key add -
gpg --keyserver pgpkeys.mit.edu --recv-key 7638D0442B90D010
gpg -a --export 7638D0442B90D010 | sudo apt-key add -
sudo nano /etc/apt/sources.list
Add a line like this:
deb http://deb.debian.org/debian/ stretch-backports main contrib non-free
Do a "sudo apt update" command to refresh the list of available packages.
To add a package that is in backports you can do a "sudo apt install -t stretch-backports xxx" where xxx is the name of the package you want to install.
2 comments:
Thank you, just watch I was looking for!!
With a firewall, it is better to use :
sudo apt install dirmngr
gpg --keyserver hkp://pgpkeys.mit.edu:80 --recv-key 8B48AD6246925553
gpg -a --export 8B48AD6246925553 | sudo apt-key add -
gpg --keyserver hkp://pgpkeys.mit.edu:80 --recv-key 7638D0442B90D010
gpg -a --export 7638D0442B90D010 | sudo apt-key add -
else when you use :
gpg --keyserver pgpkeys.mit.edu --recv-key 8B48AD6246925553
you will have the error :
gpg: keyserver receive failed: No data.
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