Unix.LoveLetter is the VBS/LoveLetter.A virus that is ported to a generic unix shell script and contains the functionality of the original Windows e-mail worm.
Unix.LoveLetter is not widespread at all.
Information about the original VBS/LoveLetter.A is available at: https://www.F-Secure.com/v-descs/love.shtml
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.