I had debian jessie installed and just perform an update with the command:sudo apt-get update && apt-get upgradeThe problem is that I upgrade to version 9 of debian and now when I run the same command to update (debian9) it throws me errors of public keys, repository not found or unsigned.Is there any way to get back to version 8.7 of debian or to fix this error without uninstalling?Thanks!
How to fix update problems with debian 9?
linux;debian;repository;gpg