Hi,
After doing 'which autoscan' if it comes back as not found, you'll want to install autoscan. To do so, see below:
1. sudo to become superuser
2. Run either:
sudo aptitude install autoscan
OR
sudo apt-get install autoscan
These will install the autoscan package from the repositories setup on the Linux box. If you want to make sure your packages are up to date, you can run:
sudo apt-get update
Run this command after changing /etc/apt/sources.list or /etc/apt/preferences . This command periodically to make sure your source list is up-to-date.