Assuming that no one else has physical access to my computer, assuming that I don't run any unusual services, do I still need a strong password for my Ubuntu user account (it has admin privileges)?
I've heard that any Ubuntu system connected to the Internet needs a strong password because it may somehow affect not only this particular system, but even other machines with Internet access as well (for example, it would be easier to install spambots on a machine with a weak password). Is this true? How exactly does this happen? Do I also need strong passwords on my VirtualBox test systems?