Workaround by Steven Major (semajor) from
https://answers.launchpad.net/ubuntu/+source/update-manager/+question/172657:
in a terminal, submit:
sudo apt-get update
There will be an error like this:
GPG error: http://software.rc.fas.harvard.edu natty/ Release: The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY ####
where #### is some string of digits and letters.
'####' is the missing key. To provide this key, submit:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ####
---
This way of stopping "untrusted software" is harmful in 3 ways:
1. User is not aware what these keys really mean, so it contributes nothing to
security.
2. It stops updating the whole system because of one questionable source.
3. It reminds of ancient mswindows idiocy to dictate what software is good for
user and what is not.
A GUI warning for user to think again before installing, is maximum that
is still ethical, imho.
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https://bugs.launchpad.net/bugs/705988
Title:
[master] Untrusted packages can not be installed
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