Client shutdown [sometimes] hangs

Hello all!

My name is Mauro Tollardo and I'm new in the list.

I'm building a small computer room for an orphanage in Kenya using LTSP 
with Ubuntu Mate 16.04 with some laptops as thin/fat clients. I followed 
the instructions in http://wiki.ltsp.org/wiki/Installation/Ubuntu 
choosing the chrootless (or pnp) way with two dual nic.

Everything seems ok. The only problem regards shutting down the clients: 
they reach rapidly "Reached target shutdown". Sometimes there is a 
warning: "D-Bus connection terminated. Failed to start poweroff.target: 
connection reset by peer.  Failed to open /dev/initctl no such device or 
address. Failed to talk to init daemon.

If I wait for a while (20 sec) some clients reach the power off. Others 
stop there.

I googled a lot but I found no solutions. Any ideas?

Thanks a lot.

Mauro





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