You must have seen this error while installing some packages though apt-get or aptitude in Ubuntu. The reason for the error is the the GPG keys for that package is not available in your system DB, hence the package can’t be verified.
The fix is pretty much simple, you just need to download the GPG keys for the package and then re-install the package.

To get the missing keys:

$ gpg --keyserver --recv-keys AED4B06F473041FA
gpg: Total number processed: 1
gpg: imported: 1

To add the missing key to the keys DB:

gpg --armor --export AED4B06F473041FA| apt-key add -

Simply update apt-get

apt-get update

Now try installing the package, it should work.

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