AWS 'vol-xxxxxxx' with Marketplace codes may not be attached as as secondary device issue

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http://serverfault.com – I'm encountering the same problem as here: http://www.quora.com/Amazon-EC2/Is-it-possible-to-rescue-an-EBS-volume-w.... Basically I've locked myself out of the instance and I don't have any snapshots. I was working on a larger setup and for security reasons I tried setting up UsePam no in sshd_config which borked everything. I used the official Debian Amazon Marketplace AMI. Now I'm not allowed to mount the volume somewhere else as a secondary device to fix my stupidity. The solution listed in the quora thread isn't working. I tried it with two ubuntu images and the i (HowTos)