Question #77121 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/77121
Status: Open => Answered
marcobra (Marco Braida) proposed the following answer:
To add your keys, please try this:
Open a Terminal from the menu Applications → Accessories → Terminal and
type or better copy and paste a row a time then press enter:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com A040830F7FAC5991
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com DCF9F87B6DFBCBAE
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 58403026387EE263
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 28A8205077558DD0
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 60487016493B3065
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 2836CB0A8AC93F7A
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 60D11217247D1CFF
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3B22AB97AF1CDFA9
Then type: (when the system ask you a password give your user password, you
will not see nothing when you type it, then press enter)
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
to update your system.
Hope this helps
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