aspell-ar software package provides Arabic dictionary for aspell, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install aspell-ar
aspell-ar is installed in your system.
Make ensure the aspell-ar package were installed using the commands given below,
$ sudo dpkg-query -l | grep aspell-ar *
You will get with aspell-ar package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Text Processing |
| Package | aspell-ar |
| Version | 0.0.20060329-5 |
| Description | Arabic dictionary for aspell |
| Sub Section | Text |