Missing dependency: python-ptrace
Binary package hint: fusil
Fusil version 0.8 depends on python-ptrace package (old package name is "ptrace") version 0.3 whereas the dependency is missing. The version 0.8 is "old" and a new (fixed) Debian package is available: Fusil 0.9.1.
Updating Fusil only impacts Fusil itself since no other program uses Fusil or python-ptrace packages.
Note: I'm the author of Fusil.