$ apt-cache policy thunderbird
thunderbird:
  Installed: 15.0.1+build1-0ubuntu2
  Candidate: 15.0.1+build1-0ubuntu2
  Version table:
 *** 15.0.1+build1-0ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages
        100 /var/lib/dpkg/status
$ apt-cache policy evolution-data-server
evolution-data-server:
  Installed: (none)
  Candidate: 3.6.0-0ubuntu1
  Version table:
     3.6.0-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages

$ gdb /usr/lib/thunderbird/thunderbird
GNU gdb (GDB) 7.5-ubuntu
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/lib/thunderbird/thunderbird...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/lib/thunderbird/thunderbird 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe3b81700 (LWP 16344)]
[New Thread 0x7fffe317c700 (LWP 16345)]
[New Thread 0x7fffe297b700 (LWP 16346)]
[New Thread 0x7fffe1b12700 (LWP 16347)]
[New Thread 0x7fffe0fff700 (LWP 16348)]
[New Thread 0x7fffe0138700 (LWP 16349)]
[New Thread 0x7fffdf303700 (LWP 16350)]
Fontconfig warning: "/etc/fonts/conf.d/65-culmus.conf", line 12: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-culmus.conf", line 34: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-culmus.conf", line 44: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-culmus.conf", line 55: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-culmus.conf", line 66: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-culmus.conf", line 77: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-culmus.conf", line 89: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-culmus.conf", line 101: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/65-culmus.conf", line 111: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum-coding.conf", line 10: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: "/etc/fonts/conf.d/90-fonts-nanum-coding.conf", line 22: Having multiple values in <test> isn't supported and may not works as expected
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
[New Thread 0x7fffddcff700 (LWP 16351)]
[New Thread 0x7fffdd0fe700 (LWP 16352)]
[New Thread 0x7fffd86ff700 (LWP 16353)]
[New Thread 0x7fffd61f9700 (LWP 16354)]
enigmail.js: Registered components
[New Thread 0x7fffd54ff700 (LWP 16355)]
[New Thread 0x7fffd4cfe700 (LWP 16356)]
[New Thread 0x7fffd44fd700 (LWP 16357)]
[New Thread 0x7fffd3aff700 (LWP 16358)]
[New Thread 0x7fffd32fe700 (LWP 16359)]
[Thread 0x7fffd61f9700 (LWP 16354) exited]
[Thread 0x7fffd4cfe700 (LWP 16356) exited]
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
[New Thread 0x7fffd2afd700 (LWP 16368)]
[Thread 0x7fffd32fe700 (LWP 16359) exited]
[Thread 0x7fffd44fd700 (LWP 16357) exited]
[Thread 0x7fffd3aff700 (LWP 16358) exited]
[New Thread 0x7fffd61f9700 (LWP 16379)]
[New Thread 0x7fffd4cfe700 (LWP 16380)]
[Thread 0x7fffd2afd700 (LWP 16368) exited]
[New Thread 0x7fffd2afd700 (LWP 16381)]
[Thread 0x7fffd4cfe700 (LWP 16380) exited]
[New Thread 0x7fffd4cfe700 (LWP 16382)]
[Thread 0x7fffd2afd700 (LWP 16381) exited]
[New Thread 0x7fffd2afd700 (LWP 16383)]
[Thread 0x7fffd4cfe700 (LWP 16382) exited]
[New Thread 0x7fffd4cfe700 (LWP 16384)]
[Thread 0x7fffd4cfe700 (LWP 16384) exited]
[New Thread 0x7fffd4cfe700 (LWP 16385)]
[Thread 0x7fffd2afd700 (LWP 16383) exited]
[New Thread 0x7fffd2afd700 (LWP 16386)]
[Thread 0x7fffd4cfe700 (LWP 16385) exited]
[New Thread 0x7fffd4cfe700 (LWP 16387)]
[New Thread 0x7fffd32fe700 (LWP 16388)]
caught error TypeError: Cc['@mozilla.org/mime/pgp-mime-decrypt;1'] is undefinedmimeDecrypt.jsm: MimeDecryptor registration done[New Thread 0x7fffd44fd700 (LWP 16389)]
[New Thread 0x7fffcc8ff700 (LWP 16390)]
[Thread 0x7fffd2afd700 (LWP 16386) exited]
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
[Thread 0x7fffd44fd700 (LWP 16389) exited]
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
[New Thread 0x7fffd2afd700 (LWP 16407)]
[New Thread 0x7fffd44fd700 (LWP 16408)]
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag

(thunderbird:16340): GLib-CRITICAL **: g_find_program_in_path: assertion `program != NULL' failed

(thunderbird:16340): GLib-CRITICAL **: g_find_program_in_path: assertion `program != NULL' failed
[New Thread 0x7fffc99ff700 (LWP 16554)]
[New Thread 0x7fffc91fd700 (LWP 16555)]
[New Thread 0x7fffc89fc700 (LWP 16556)]
[New Thread 0x7fffc7ddb700 (LWP 16557)]
[New Thread 0x7fffc75da700 (LWP 16558)]
[New Thread 0x7fffc6dd9700 (LWP 16559)]
[New Thread 0x7fffc65d8700 (LWP 16560)]

(thunderbird:16340): e-data-server-ERROR **: Error calling StartServiceByName for org.gnome.evolution.dataserver.Sources0: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program /usr/lib/evolution/evolution-source-registry: Success

Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to Thread 0x7fffc65d8700 (LWP 16560)]
0x00007ffff141ac7f in g_logv () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) n
Program not restarted.
(gdb) bt
#0  0x00007ffff141ac7f in g_logv () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ffff141ae42 in g_log () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffdb3c62c0 in ?? () from /usr/lib/libedataserver-1.2.so.17
#3  0x00007ffff1437645 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ffff73c1e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007ffff70eecbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()
(gdb) x/8i $pc
=> 0x7ffff141ac7f <g_logv+527>:	
    lea    0x2a74da(%rip),%rdi        # 0x7ffff16c2160
   0x7ffff141ac86 <g_logv+534>:	mov    %r12d,%esi
   0x7ffff141ac89 <g_logv+537>:	callq  0x7ffff1451000 <g_private_set>
   0x7ffff141ac8e <g_logv+542>:	test   %r13d,%r13d
   0x7ffff141ac91 <g_logv+545>:	jle    0x7ffff141acab <g_logv+571>
   0x7ffff141ac93 <g_logv+547>:	nopl   0x0(%rax,%rax,1)
   0x7ffff141ac98 <g_logv+552>:	sub    $0x1,%r13d
   0x7ffff141ac9c <g_logv+556>:	bt     %r13,%r15
(gdb) info reg
rax            0x6	6
rbx            0x2	2
rcx            0x4	4
rdx            0x7ffff7ede040	140737352949824
rsi            0x0	0
rdi            0x7ffff7ede040	140737352949824
rbp            0x7fffdb3deb2e	0x7fffdb3deb2e
rsp            0x7fffc65d7cb0	0x7fffc65d7cb0
r8             0x7ffff7ede040	140737352949824
r9             0x0	0
r10            0x7ffff7ede220	140737352950304
r11            0x7fffcb9bda00	140736609376768
r12            0x0	0
r13            0x2	2
r14            0x7ffff141a4c0	140737240999104
r15            0x4	4
rip            0x7ffff141ac7f	0x7ffff141ac7f <g_logv+527>
eflags         0x246	[ PF ZF IF ]
cs             0x33	51
ss             0x2b	43
ds             0x0	0
es             0x0	0
fs             0x0	0
---Type <return> to continue, or q <return> to quit---
gs             0x0	0
(gdb) q
A debugging session is active.

	Inferior 1 [process 16340] will be killed.

Quit anyway? (y or n) y