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Hi, After than Gvdhoorn's answer. I googled little bitr more. I installed below packets; su

sudo apt-get install gnupg
sudo apt-get install dirmngr

Than redo below code,

sudo apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key s421C365BD9FF1F717815A3895523BAEEB01FA116

Than now everything fine again... ;-)

Regards, Mucip:)

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