Wubi is the program that allows Windows users to install Linux (specifically the Ubuntu distro) as if it is another windows program with the advantage of allowing Linux act as a separate operating system. As a matter of fact, after installation it even allow you to choose where to boot (i.e., Windows or Linux). Seems a happy ending? Nope.
One must have to be careful in trusting the installed Linux using Wubi, (let us create a name WuLinx to mean a Linux installed with Wubi) as it might be corrupted and you won't be able to recover important files inside WuLinx. Why? Isn't it true that Linux has this so called journalizing file system (ext3), that allows system recovery during some crashes? Yes it's true, and personally, I have experienced crashes before in a Linux operating system but because of this ext3 file system my Linux was able to recover. However, it's a different story on WuLinx because it uses the Windows ntfs file system. A file system native to Windows and hence, journalizing is impossible.
So, if you are using WuLinx -- you are already warned.
Finally, periodically create a backup copy of your files inside WuLinx.
Fin.
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