Errors in auth.log show:

Sep 26 19:43:51 vagrant-ubuntu-raring-64 sshd[1442]: error: Could not load host 
key: /etc/ssh/ssh_host_rsa_key
Sep 26 19:43:51 vagrant-ubuntu-raring-64 sshd[1442]: error: Could not load host 
key: /etc/ssh/ssh_host_dsa_key
Sep 26 19:43:51 vagrant-ubuntu-raring-64 sshd[1442]: error: Could not load host 
key: /etc/ssh/ssh_host_ecdsa_key
Sep 26 19:43:53 vagrant-ubuntu-raring-64 sshd[1442]: fatal: No supported key 
exchange algorithms [preauth]

Problem temporarily worked-around by doing this:


sudo ssh-keygen -f /etc/ssh/ssh_host_ecdsa_key -N '' -t ecdsa
sudo ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
sudo ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa

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https://bugs.launchpad.net/bugs/1217950

Title:
  SSH public key isn't created in vagrant cloud images

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