Today while updating / installing packages in Ubuntu I got GPG error. Error was,
W: GPG error: http://packages.medibuntu.org maverick Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 2EBC26B60C5A2783
So it was asking me to add GPG key for the repository http://packages.medibuntu.org maverick Release.
To solve this, you need to run following commands:
gpg --keyserver keyserver.ubuntu.com --recv-key 2EBC26B60C5A2783
We got 2EBC26B60C5A2783 from the error.
Now run,
gpg -a --export 2EBC26B60C5A2783 | sudo apt-key add -
This will add gpg key, and then run apt-get update to update your package list.
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My name is Vidyadhar Sarmalkar & I work as a consultant and have done RHCE & CCNA. 
