Lab 9.1 - Typo in ubuntu command.

tomp736

Create a new configuration for the LMTP protocol if required.

echo 'protocols = $protocols lmtp'> \/usr/share/dovecot/protocols.d/lmtp.protocol

It looks like a typo unless the package files have changed since this was published.
The following files are included in ubuntu when installing dovecot.

imapd.protocol  lmtpd.protocol  pop3d.protocol  

Just as a side note - it would be nice if some of the scripts were more copy/paste-able, multi-line command don't copy and paste well and I am sure that there are elements in PDF which allow for better multi-line selection. Sometimes it is hard to tell where a space should be done versus a break in a word.