system
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I can’t say about Ubuntu, but on my openSUSE 10.3 box there is a scan directory option in the context menu, but I never use it the GUI scanner and I have our differences.
Take my advice, save yourself time, system resources, and several headaches and use the command line scanner, all you have to do is type in the following commands:
sudo avast-update
sudo avast /(location of where your system mounts to)/(name of your USB drive)
If I were to do it on my computer I would have to type “sudo avast /media/disk” to scan it, because SUSE mounts to /media (others could be /mnt, /mount) (as Tech pointed out), then I have my system mounts my USB disk in a directory called “disk”.