You were payed to install and test.
Just because your testing did not prove it was
a good solution for your current ennvironment
does not mean the time was wasted.
YOU USED IT PROFESSIONALLY!
Put it on the resume, be very clear about your usage.
The key issue is that anyone who claims years and
years of desktop and LAN network experience to have
ZERO Linux on his resume is someone who hasn't bothered
to even investigate one of the hottest tech topics
in years. Which means I would not want that person
working in my environment, even if it is purely an
MS shop. Which very few are nowadays.