Updated the FAQ with the error produced if python[2-3]-bcc isn't installed.
diff --git a/FAQ.txt b/FAQ.txt
index 03b9a74..c898afb 100644
--- a/FAQ.txt
+++ b/FAQ.txt
@@ -38,3 +38,10 @@
Q: hello_world.py fails with:
ImportError: No module named past.builtins
A: sudo pip install future
+
+Q: Running one of the bcc tools produces an import error:
+ Traceback (most recent call last):
+ File "./execsnoop", line 20, in <module>
+ from bcc import BPF
+ ImportError: No module named bcc
+A: Make sure the python bcc bindings package (python2-bcc) is installed.