kde-l10n-sl software package provides Slovenian (sl) localization for KDE, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kde-l10n-sl
kde-l10n-sl is installed in your system.
Make ensure the kde-l10n-sl package were installed using the commands given below,
$ sudo dpkg-query -l | grep kde-l10n-sl *
You will get with kde-l10n-sl package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | KDE |
| Package | kde-l10n-sl |
| Version | 4:4.13.0-0ubuntu1 |
| Description | Slovenian (sl) localization for KDE |
| Sub Section | KDE |