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When I update my system, I get the following errors:

Fetched 316 B in 22s (14 B/s)
Reading package lists... Done

W: GPG error: http://ppa.launchpad.net trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6AF0E1940624A220

Please someone suggest me a solution to this.

Sooraj Soman
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1 Answers1

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You have to download the missing keys using this command in your case:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6AF0E1940624A220

For the CDRom errors check This thread

Community
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DriesSw
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