I got a core file from the crash and a backtrace from GDB. It looks like it's in a shared library outside of calibre. Perhaps this is related to the fact that Calibre now requires Python 2.6, but Ubuntu 8.10 ships with Python 2.5.
Code:
Core was generated by `/usr/local/calibre/loader /home/bloovis/doc/books/Austen/sense11p.pdf sense11p.'.
Program terminated with signal 11, Segmentation fault.
[New process 18812]
#0 0xb58bb2c6 in ?? () from /lib/libuuid.so.1
(gdb) bt
#0 0xb58bb2c6 in ?? () from /lib/libuuid.so.1
#1 0xb58bb33f in ?? () from /lib/libuuid.so.1
#2 0xb58bb510 in uuid__generate_random () from /lib/libuuid.so.1
#3 0xb58bb5bb in uuid_generate_random () from /lib/libuuid.so.1
#4 0xb55e2ebf in ffi_call_SYSV () from /usr/local/calibre/_ctypes.so
#5 0xb55e2cfe in ffi_call () from /usr/local/calibre/_ctypes.so
#6 0xb55dde85 in _CallProc () from /usr/local/calibre/_ctypes.so
#7 0xb55d73d2 in ?? () from /usr/local/calibre/_ctypes.so
#8 0xb7f4855c in PyObject_Call () from /usr/local/calibre/libpython2.6.so.1.0
#9 0xb7fda1f1 in PyEval_EvalFrameEx () from /usr/local/calibre/libpython2.6.so.1.0
#10 0xb7fdbd5c in PyEval_EvalFrameEx () from /usr/local/calibre/libpython2.6.so.1.0
#11 0xb7fdc561 in PyEval_EvalCodeEx () from /usr/local/calibre/libpython2.6.so.1.0
#12 0xb7f71347 in ?? () from /usr/local/calibre/libpython2.6.so.1.0
#13 0xb7f4855c in PyObject_Call () from /usr/local/calibre/libpython2.6.so.1.0
#14 0xb7f5b599 in ?? () from /usr/local/calibre/libpython2.6.so.1.0
#15 0xb7f4855c in PyObject_Call () from /usr/local/calibre/libpython2.6.so.1.0
#16 0xb7f9c986 in ?? () from /usr/local/calibre/libpython2.6.so.1.0
#17 0xb7f9b515 in ?? () from /usr/local/calibre/libpython2.6.so.1.0
#18 0xb7f4855c in PyObject_Call () from /usr/local/calibre/libpython2.6.so.1.0
#19 0xb7fda1f1 in PyEval_EvalFrameEx () from /usr/local/calibre/libpython2.6.so.1.0
#20 0xb7fdbd5c in PyEval_EvalFrameEx () from /usr/local/calibre/libpython2.6.so.1.0
#21 0xb7fdc561 in PyEval_EvalCodeEx () from /usr/local/calibre/libpython2.6.so.1.0
#22 0xb7f71347 in ?? () from /usr/local/calibre/libpython2.6.so.1.0
#23 0xb7f4855c in PyObject_Call () from /usr/local/calibre/libpython2.6.so.1.0
#24 0xb7f5b599 in ?? () from /usr/local/calibre/libpython2.6.so.1.0
#25 0xb7f4855c in PyObject_Call () from /usr/local/calibre/libpython2.6.so.1.0
#26 0xb7f9cd18 in ?? () from /usr/local/calibre/libpython2.6.so.1.0
#27 0xb7f4855c in PyObject_Call () from /usr/local/calibre/libpython2.6.so.1.0
#28 0xb7fda1f1 in PyEval_EvalFrameEx () from /usr/local/calibre/libpython2.6.so.1.0
#29 0xb7fdbd5c in PyEval_EvalFrameEx () from /usr/local/calibre/libpython2.6.so.1.0
#30 0xb7fdc561 in PyEval_EvalCodeEx () from /usr/local/calibre/libpython2.6.so.1.0
#31 0xb7fdaeb0 in PyEval_EvalFrameEx () from /usr/local/calibre/libpython2.6.so.1.0
#32 0xb7fdc561 in PyEval_EvalCodeEx () from /usr/local/calibre/libpython2.6.so.1.0
#33 0xb7fdc673 in PyEval_EvalCode () from /usr/local/calibre/libpython2.6.so.1.0
#34 0x080497a8 in _start ()