How to uninstall libfann1 from Ubuntu
To uninstall just libfann1 package itself from Ubuntu execute on terminal:
sudo apt-get remove libfann1
Uninstall libfann1 and it's dependent packages
To uninstall the libfann1 package and any other dependant package which are no longer needed on Ubuntu.
sudo apt-get autoremove libfann1
If you also want to delete configuration and/or data files of libfann1 from Ubuntu then this will work:
sudo apt-get purge libfann1
To delete configuration and/or data files of libfann1 and it's dependencies from Ubuntu then execute:
sudo apt-get autoremove --purge libfann1
libfann1 package information
Fast Artificial Neural Network Library (fann)
Fast Artificial Neural Network Library implements multilayer artificial neural networks in C with support for both fully connected and sparsely connected networks. Cross-platform execution in both fixed and floating point are supported. It includes a framework for easy handling of training data sets. It is easy to use, versatile, well documented, and fast. This package contains the shared libraries.
More information about apt-get remove
Advanced Package Tool, or APT, is a free software user interface that works with core libraries to handle the installation and removal of software on Debian, Ubuntu and other Linux distributions. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from precompiled files or by compiling source code.
apt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library.
apt-get remove is identical to install except that packages are removed instead of installed. Note that removing a package leaves its configuration files on the system. If a plus sign is appended to the package name (with no intervening space), the identified package will be installed instead of removed.