Here's a "gdb attach" backtrace of the hung process:
> pstree -p
─dpkg(24158)───update-notifier(19121)───package-data-do(19123)
│ │
└─{precise}(9759)
(gdb) attach 19123
(gdb) bt
#0 0x00007fcdc8074102 in recv () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00000000004902a0 in sock_recv_guts ()
#2 0x0000000000493d2f in sock_recv.59458 ()
#3 0x0000000000486614 in PyEval_EvalFrameEx ()
#4 0x000000000048d930 in PyEval_EvalCodeEx ()
#5 0x0000000000486bb8 in PyEval_EvalFrameEx ()
#6 0x000000000048d930 in PyEval_EvalCodeEx ()
#7 0x0000000000486bb8 in PyEval_EvalFrameEx ()
#8 0x000000000048d930 in PyEval_EvalCodeEx ()
#9 0x0000000000486bb8 in PyEval_EvalFrameEx ()
#10 0x0000000000486e02 in PyEval_EvalFrameEx ()
#11 0x000000000048d930 in PyEval_EvalCodeEx ()
#12 0x00000000004246a1 in PyRun_FileExFlags ()
#13 0x000000000042492e in PyRun_SimpleFileExFlags ()
#14 0x0000000000425cb6 in Py_Main ()
#15 0x00007fcdc6d7376d in __libc_start_main () from
/lib/x86_64-linux-gnu/libc.so.6
#16 0x000000000041bb31 in _start ()
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https://bugs.launchpad.net/bugs/1243090
Title:
Dist Upgrade from 13.04 to 13.10 stuck during flashplugin-installer
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