Fix file permission problem - the authorized_keys file was still owned by root since the chown call came before its creation.

live-build/ubuntu-cpc/hooks/042-vagrant.binary

@@ -84,10 +84,10 @@ EOF
 # vagrant ecosystem (https://www.vagrantup.com/docs/boxes/base.html)
 chroot ${mount_d} chmod 0440 /etc/sudoers.d/vagrant
 chroot ${mount_d} mkdir -p /home/vagrant/.ssh
-chroot ${mount_d} chown -R vagrant: /home/vagrant/.ssh
 cat << EOF > ${mount_d}/home/vagrant/.ssh/authorized_keys
 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6NF8iallvQVp22WDkTkyrtvp9eWW6A8YVr+kz4TjGYe7gHzIw+niNltGEFHzD8+v1I2YJ6oXevct1YeS0o9HZyN1Q9qgCgzUFtdOKLv6IedplqoPkcmF0aYet2PkEDo3MlTBckFXPITAMzF8dJSIFo9D8HfdOV0IAdx4O7PtixWKn5y2hMNG0zQPyUecp4pzC6kivAIhyfHilFR61RGL+GPXQ2MWZWFYbAGjyiYJnAmCP3NOTd0jMZEnDkbUvxhMmBYSdETk1rRgm+R4LOzFUGaHqHDLKLX+FIPKcF96hrucXzcWyLbIbEgE98OHlnVYCzRdK8jlqm8tehUc9c9WhQ== vagrant insecure public key
 EOF
+chroot ${mount_d} chown -R vagrant: /home/vagrant/.ssh
 
 umount_disk_image "$mount_d"
 rmdir "$mount_d"