After installing pyusb under Ubuntu Jaunty (AMD64) kernel the command:
dev = usb.core.find()
raised the following exception:
File "/usr/local/lib/python2.6/dist-packages/usb/core.py", line 784,
in find
raise ValueError('No backend is available in the system')
ValueError: No backend is available in the system
I traced the problem back to usb/backend/libusb01.py
libname = ctypes.util.find_library('usb')
After some wrestling with the regular expression in find_library, I
noticed that in my system the file is called libusb-0.1 which does not
match this nice looking pattern:
expr = r'(\S+)\s+\((%s(?:, OS
ABI:[^\)]*)?)\)[^/]*(/[^\(\)\s]*lib%s\.[^\(\)\s]*)' \
% (abi_type, re.escape(name))
After changing the source to
libname = ctypes.util.find_library('usb-0.1')
all works well.
I guess the take-away from this is that this old library has a new name,
at least on newer Ubuntu systems.
Michael
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