[Libguestfs] firstboot randomly can't find script

I am running the stock libguestfs on latest Ubuntu 16.04 (1:1.32.2-4ubuntu2). My guests are also Ubuntu 16.04. I am running virt-sysprep with --firstboot-command 'dpkg-reconfigure openssh-server'. This works 90% of the time, but occasionally when a new guest first starts it can't find the script: ~# cat virt-sysprep-firstboot.log /etc/init.d/virt-sysprep-firstboot start Scripts dir: /usr/lib/virt-sysprep/scripts === Running /usr/lib/virt-sysprep/scripts/0001-dpkg-reconfigure-openssh-server === /usr/lib/virt-sysprep/firstboot.sh start Scripts dir: /usr/lib/virt-sysprep/scripts /etc/init.d/virt-sysprep-firstboot: 35: /etc/init.d/virt-sysprep-firstboot: /usr/lib/virt-sysprep/scripts-done/0001-dpkg-reconfigure-openssh-server: not found As such, I cannot ssh into these guests without opening them manually on the host and running the dpkg reconfigure command. This bug seems similar, but I cannot find other reports or fixes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=773106 Any suggestions to debug or workaround?