Thanks for reporting.
The error occurs because the GPG key used to sign the list of software
available in the repository has not been imported into the APT keyring.
Did you add the extras.ubuntu.com repository manually to
/etc/apt/sources.list or did you use another mean to add the "extras"
repository?
(Meanwhile, you can fix the error by opening a terminal and typing:
gpg --keyserver keyserver.ubuntu.com --recv-keys 16126D3A3E5C1192
gpg --armor --export 16126D3A3E5C1192 | apt-key add -)
** Changed in: apt (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/884668
Title:
sudo apt-get update fails to update extras repository because of
unavailable public key
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