I believe a dual boot scenario and grub-legacy-ec2 is well outside the intended scope. I'm closing this as "Wont fix" in as nice a way as possible. Generally grub-legacy-ec2 just shouldn't be installed except for a OS that might be running in EC2.
** Changed in: cloud-init (Ubuntu) Status: Incomplete => Won't Fix -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to cloud-init in Ubuntu. https://bugs.launchpad.net/bugs/798555 Title: package grub-legacy-ec2 0.5.10-0ubuntu1.5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/798555/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs