Ubuntu
update-manager package

just installed ubuntu 12.04 and am trying to update

Asked by Susan Hannah

W: GPG error: http://extras.ubuntu.com precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192

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Ubuntu update-manager Edit question
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actionparsnip (andrew-woodhead666) said : 		#1

If you run:

sudo apt-get upgrade; sudo apt-get dist-upgrade

It will update the system. GPG keys are not critical to updates and the new packages may cure the issue.

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