i usualy get this problem on a bad install of the OS...im not telling you to just go ahead and reformat but when i have hardware troubles, or plugin problems , i normaly do have to format the drive again myself because for me it generally means more then just 1 thing is missing from the drive also i had alot of problems with 6.06 myself, try going to an older version. if all else fails try a format and depending on how new to linux you are send me a msg and ill tell you what option to use to format if you dont already know