Download GPG Authentication Key Assuming you already have GPG (GnuPG) installed (most Linux distro these days have GPG pre-installed), you can download a copy of your Linux distributions official key. Sudo apt-get update & & sudo apt-get upgrade -y & sudo apt-get dist-upgrade -y & sudo apt-get install packagename (or) apt-get update & apt-get upgrade -y & apt-get dist-upgrade -y & apt-get install packagename (where packagename refers to the package that failed to install in the first place) Once you’ve updated, upgraded, you should be able to install any packages without errors. ![]() Just use the following command in any Debian based Linux Operation system such as Debian itself, Ubuntu, Kali Linux, Linux Mint etc. E: Package ‘ packagename‘ has no installation candidate” error However, this is rather eacy to fix. ![]() This may mean that the package is missing, has been obsoleted, or is only available from another source.
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