Last night I received an email, the main content of which was clearly spam, though trying to blackmail me, the reason for my concern was the heading included a password that I use, though not frequently. The email claimed to use a keylogger to get this password. I have not visited the site that I use the password for, for some time and as Firefox remembers the password I would not have typed it in. I scanned my desktop (Ubuntu 16.04) with clam tk and it picked up 60 items which I quarantined, these were in Libre office and not Firefox. I have since deleted and re-installed both Firefox and Libre office, and changed passwords. My concern is, how did it get hold of a password?, and other than what I have already done is there any other measures I should take to secure my computer? Thanks in advance