I wonder why you get all these weird segfaults :-)

I can definitely see you have a null pointer dereference in that stack
trace, but looking in the code that specific pointer should not be able
to be null unless there is some other critical error condition. Or in
fact, line 925 in daemon.c can not, not even in theory, cause a null
dereference... However line 924 can -  so there must be some line skew
in the trace...

Line 924 can err if the UnityPackageSearcher fails to initialize
somehow, but this should cause a message:

  "Error loading package indexes: $something"

to appear on stderr which I'd assume we should see in your .xessesion-
error - which I don't see. There is a bug somewhere that that the
Software Center index is some times not generated, which can in fact
cause this error to happen - which might also explain why software
center fails to start.

-- 
unity-applications-daemon crashed with SIGSEGV in 
unity_applications_place_daemon_update_pkg_search()
https://bugs.launchpad.net/bugs/624169
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