chattr is a program that you can install on Debian (and other systems) to change various attributes of files. I've recently used chattr to make files immutable. When a file is made immutable by chattr, it makes it so that the file can't be changed - not even by root! 

To install chattr on Debian, and probably on Ubuntu and other Debian derivatives, you can install the e2fsprogs package.

To install the e2fsprogs package on your Debian computer, just run the following command:

apt-get install e2fsprogs

Now chattr will be installed on your system and you can make a file immutable by running:

chattr +i /path/to/filename

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