I also had this problem. But the bug was in the script I created to automate the process of customization[1]. I don't remove the link /sbin/initctl when exit from chroot as described [2]. I resolved my problem by removing this link.
[1] - https://help.ubuntu.com/community/LiveCDCustomization [2] - https://help.ubuntu.com/community/LiveCDCustomization#Cleanup
I also had this problem. But the bug was in the script I created to automate the process of customization[1]. I don't remove the link /sbin/initctl when exit from chroot as described [2]. I resolved my problem by removing this link.
[1] - https:/ /help.ubuntu. com/community/ LiveCDCustomiza tion /help.ubuntu. com/community/ LiveCDCustomiza tion#Cleanup
[2] - https:/