apt-get install bpftrace on Debian installs the executable /usr/bin/bpftrace whereas various scripts *.py assume /usr/local/bin/bpftrace.
The discrepancy should be solved by employing the generic shebang #!/usr/bin/env bpftrace instead of #!/usr/local/bin/bpftrace througout. Please let me know if I should submit a corresponding PR (following PR #26).