For the last month on my Ubuntu 13.10 system, Software and Updates always shows that the laptop is up to date. I tried to change the server for updates but with the same result.
So is it normal?
This is often to be expected, especially if updates are being installed automatically behind the scenes (which you can configure in the Software Updater). And sometimes, a month or more goes by without any updates being released.
Why does so much time sometimes pass with no new updates? With default settings, it is intended that users of stable releases only get updates for security bugs and serious stability/usability bugs; in Ubuntu, updates to provide new features are not typically rolled out after the end of a release's beta phase.
It's a good idea to check to make sure updates are working properly on your system, though.
Check Your Update Settings
To check your settings, run the Software Updater [Update Manager for people using old versions of Ubuntu] and click Settings.... You might have to wait for it to automatically check for updates, before being able to do that.
The Software & Updates window is shown (called some different things on some other versions of Ubuntu). Under "Install updates from:", there are checkboxes for the different kinds of updates that can be installed. At least "Important security updates" should be checked, and you probably want "Recommended updates" as well.
Under that, you can choose how often to check automatically for updates, what to do when new security updates are found, and what to do when other (non-security) updates are found. If you have something relatively frequent chosen for "Automatically check for updates" and you have "Download and install automatically" chosen for "When there are security updates:", then most likely any important security updates are being installed behind the scenes for you.
But if you have "Never" selected for "Automatically check for updates," then you're not getting updates installed or even checked for automatically.
After making sure your settings are however you want them, click Close. Then I recommend checked your Ubuntu's systems record of what updates have been installed recently. That should answer the question as to whether or not you're getting updates.
Checking If Updates Are Being Installed
If your settings look good, then you should check to see if the updates you'd expect to get are really being installed automatically.
To see when updates were last installed, you may be able to see a list of everything installed recently (including updates) in the Software Center.
Or you can look at the package manager's logs, especially
If the file is empty, there's still typically no need to worry; in that case, look at
Or you can easily view it in the Terminal with:
If the dates in the log(s) show updates installed in the last couple of months, then most likely everything is fine.
If they do not, then maybe something isn't working. In that case, please edit your question to include the full contents of
(For readers with this or a similar problem other than the poster of this question, of course you shouldn't edit this question. Instead, you should post your own question, fully describing your situation; you can include the contents of that file in your question.)