Launchpad ppa signature change

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http://askubuntu.com – I've lost my GPG key which was used to sign my PPA. So, I generated a new key and deactivated old one in Launchpad. Now, I would like to change the key which is used to sign repository. Currently the ppa is unavailable duo to invalid GPG signature. My PPA: https://launchpad.net/~soroush-r/+archive/geopsy-deb (HowTos)