Hi, preinst affected after postinst was: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970783?! Don't know if the same solution may be applied for preinst.
- Bug#986779: preinst script misses dependency on dpkg-dev Daniel Leidert
- Bug#986779: preinst script misses dependency on dpkg... patrice . duroux
- Bug#986779: preinst script misses dependency on dpkg... Julien Cristau
