ubuntu crontab -e "/usr/bin/sensible-editor" killed; signal 9 (no core dumped)

Welcome to Ubuntu 11.04 (GNU/Linux 2.6.32-042stab037.1 x86_64)
user@server:~$ crontab -e
no crontab for user - using an empty one

Select an editor.  To change later, run 'select-editor'.
  1. /bin/ed
  2. /bin/nano        <---- easiest
  3. /usr/bin/mcedit
  4. /usr/bin/vim.basic

Choose 1-4 [2]: 2
crontab: "/usr/bin/sensible-editor" killed; signal 9 (no core dumped)
Received SIGHUP or SIGTERM
Error writing /tmp/crontab.qcuMPr/crontab.save: No such file or directory
Buffer not written to /tmp/crontab.qcuMPr/crontab.save: No such file or directory

Why is this happening?

https://gist.github.com/1751927

/usr/bin/sensible-editor is just a wrapper to help you choose an editor.

What happens when you do this?

export EDITOR=nano
crontab -e

Does /usr/bin/nano exist?