I've have had this serious bug happen several times after upgrading packages on bionicpup32.
after upgrading some puppy packages the system will not shutdown.
this is due to
interpreter not found
/bin/ash
somewhere in the install/upgrade path
something changes the shell to /bin/ash instead of bash
to get your system to shutdown / reboot
open terminal
cd /bin
cp bash ash
the packages added are pidgin, clonezilla,
seamonkey or palemoon