FWIW:

- It looks like this happens after kernel logging is turned off, so
nothing in syslog

- From the code, it looks likely that one of these two is responsible:
       1) do_plymouth
       2) SysLogHandler

(Because: "in progress" is printed to console, so line 91
[logging.warning(...)] is reached; and the loop must hang somewhere
since the timeout doesn't trigger. Does SysLogHandler perhaps wait for
kernel logging (/dev/log)  to come online again?)

-- 
unattended-upgrades hangs system on shutdown
https://bugs.launchpad.net/bugs/434835
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