Security

Deleting a file or reformatting a disk does not destroy your sensitive data. The data can easily be undeleted. That's a good thing if you accidentally throw something away, but what if you're trying to destroy financial data, bank account passwords, or classified company information. What if you want to clean your computer before selling it for instance?

Making sure your system is up to date is a key attribute to its security. Furthermore Ubuntu releases updates pretty often and you probably don't want to miss out on added stability and features. You could run updates manually, but why not schedule the updates in the background to make sure you are always running the latest stable versions, without ever having to worry about it.

Since 2005 there has been an immense increase in brute force SSH attacks and though Linux is pretty secure by default, it does not stop evil programs from indefinitely trying to login with different passwords. Without proper protection your server is a sitting duck waiting for a bot to guess the right combination and hit the jackpot. But with just 2 commands we can stop that.