This is not going to be easy for a beginner. First what version of Mint and is it 32 bit or 64bit ?
Assuming 64 bit
First the insanebump plugin from
http://registry.gimp.org/node/28117 downloads as InsaneBump.py_3.txt
Rename this to
InsaneBump.py Copy to your Gimp profile ~/.gimp-2.8/plug-ins and make it executable.
Insanebump uses a compiled plugin
normalmap. This is included in the package
gimp-plugin-registry which you should be able to install with a package manager. However this contains dozens scripts and plugins which you will never use so I have included a 64 bit version in the attachment.
Copy the file normalmap to your Gimp profile ~/.gimp-2.8/plug-ins and make it executable.
The next snag.
normalmap has a dependency
libGLEW.so.2.0 which might not be in the latest Mint packages. I have seen reports of it missing. However, it might be already installed or look for the package libGLEW2 and install it if it is there.
If it is not there then the libglew.deb package is included in the attachment. Click on it and with luck there will be a message asking what to do. (install it)
With everything installed, looks like this.
Attachment:
insanebump.jpg [ 113.15 KiB | Viewed 6037 times ]