My GPG key expired so I had to recreate the debian package to provide an updated key. As a result, version 0.3.7-2_all of the debian package is now available:
Unfortunately, the package manager, be it APT, Synaptic, UpdateManager, Ubuntu Software Center, or whathever, will complain because of the expired key. However testing with Ubuntu 11.04 suggests that the package manager should offer to update to the new version, which ships with the updated key and fixes the issue. See, for example, the following screenshot, that shows what happens when upgrading via APT:
as you can see, you need to force the installation of 0.3.7-2_all because by default APT refuses to install a non-authenticated package.
If the package manager does not seem to update Neubot, i.e. it keeps
reporting over and over again an error that patterns after this one:
W: A error occurred during the signature verification. The repository is
not updated and the previous index files will be used.GPG error:
http://releases.neubot.org Release: The following signatures were
invalid: KEYEXPIRED 1307547537
W: Failed to fetch http://releases.neubot.org/Release
W: Some index files failed to download, they have been ignored, or old
ones used instead.
then, in this case I suggest to download the updated package and install it at hand: Installing the updated package over the old one should fix the issue as well. (For more information on how to install it please see "how to install the debian package".)