WARNING: The following packages cannot be authenticated!

[kovax]

Today, I made my own PPA. https://launchpad.net/~dodamn/+archive/test
And I uploaded my own source package to the PPA. Finally binary package was built successfully. The package name is 'rt3070-dkms'.

I wanted to install my own package from my own PPA.
So first I registered signing key using following command.

$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F6FE71D0

(F6FE71D0 is my signing key for my PPA)

And then I added the following two lines to /etc/apt/sources.list.

deb http://ppa.launchpad.net/dodamn/test/ubuntu jaunty main
deb-src http://ppa.launchpad.net/dodamn/test/ubuntu jaunty main

And I run update command.

$ sudo apt-get update

The result of this command had no errors.

And I run install command.

$ sudo apt-get install rt3070-dkms

But the result of this command has warning 'The following packages cannot be authenticated!'.
Why does this warning occur??

The following are full message when I run 'sudo apt-get install rt3070-dkms' command.

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  rt3070-dkms
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 693kB of archives.
After this operation, 3645kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  rt3070-dkms
Install these packages without verification [y/N]?

My Ubuntu is 9.04 (Jaunty).

Please help me.

[Aaron Bentley (abentley)]

Sorry, Jaunty is no longer supported, and more recent distros provide better ways of adding ppas: apt-add-repository