Dear Member,
Whilst agreeing with all previous advice; it seems that your workplace is not a happy place. As no-one wishes a good morning, I take it that no one wishes a good evening either when leaving. Therefore, I think that you need to deal with two issues first, 1) is communication and 2) team bonding.
We experienced a similar issue recently and dealt with it by ensuring that we all have lunch together twice a week and started a conversation that had nothing to do with work. We noticed that very soon trust was building up between the workers and within a month everyone was greeting each other upon arrival and wishing a good evening when leaving. The all together lunch was reduced to once a week and during busy periods stopped completely. But restarted on an ad hoc basis.
There is no cost to the company as each bring their own lunch (we also noticed that the lunches were being shared), however, every now and then the company will organise and pay for Pizza's.
We have found this to be very effective, give it a try ..... I hope it works for you as well.
Regards
Harsh