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
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
More information on 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.