Can't get xterm to work. DISPLAY not set.

You need to use the -X flag

ssh -X user@server

In my case I was missing the xauth program on the target machine

How to debug these situations:

On the target host, run another sshd daemon to debug on another port:
```
/usr/sbin/sshd -d -p 222
```
On the source host:
```
ssh -v -Y [email protected] -p 222
```

In my situation I could see:

debug1: Remote: No xauth program; cannot forward with spoofing.

(Note: to run sshd on another port you may need to modify or temporarily disable iptables : /etc/init.d/iptables stop, or equivalent)

Try with this command:

DISPLAY=:0 xterm

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