根据@lurker 的 cmets
vmlinuz 已压缩，可以使用以下命令解压缩（来自Extract vmlinux from vmlinuz or bzImage）
$ sudo dd if=vmlinuz-3.2.0-23-generic-pae skip=`grep -a -b -o -m 1 -P '\x1f\x8b\x08\x00' vmlinuz-3.2.0-23-generic-pae| cut -d: -f 1` bs=1 | zcat > /tmp/vmlinux
4998324+0 records in
4998324+0 records out
4998324 bytes (5.0 MB) copied, 201.859 s, 24.8 kB/s
gzip: stdin: decompression OK, trailing garbage ignored
现在出错
崩溃：/var/crash/_usr_sbin_ietd.0.crash：不支持的文件格式
我们还需要使用apport-unpack 从崩溃报告中提取核心转储文件，如下所示 (from here)
@ubuntu:/tmp$ sudo apport-unpack
Usage: /usr/bin/apport-unpack <report> <target directory>
@ubuntu:/tmp$ sudo apport-unpack /var/crash/_usr_sbin_ietd.0.crash /var/crash/
ERROR: Destination directory exists and is not empty.
@ubuntu:/tmp$
@ubuntu:/tmp$ sudo mkdir coretest
@ubuntu:/tmp$ sudo apport-unpack /var/crash/_usr_sbin_ietd.0.crash /tmp/coretest/
@ubuntu:/tmp$ cd coretest/
@ubuntu:/tmp/coretest$
@ubuntu:/tmp/coretest$ ls
Architecture Date ExecutablePath ProblemType ProcCwd ProcMaps Signal UserGroups
CoreDump DistroRelease ExecutableTimestamp ProcCmdline ProcEnviron ProcStatus Uname
@ubuntu:/tmp/coretest$ ls -lt
total 384
-rw-r--r-- 1 root root 4 May 29 00:13 Architecture
-rw-r--r-- 1 root root 24 May 29 00:13 Date
-rw-r--r-- 1 root root 12 May 29 00:13 DistroRelease
-rw-r--r-- 1 root root 10 May 29 00:13 ExecutableTimestamp
-rw-r--r-- 1 root root 339968 May 29 00:13 CoreDump
-rw-r--r-- 1 root root 5 May 29 00:13 ProblemType
-rw-r--r-- 1 root root 66 May 29 00:13 ProcEnviron
-rw-r--r-- 1 root root 969 May 29 00:13 ProcMaps
-rw-r--r-- 1 root root 737 May 29 00:13 ProcStatus
-rw-r--r-- 1 root root 2 May 29 00:13 Signal
-rw-r--r-- 1 root root 31 May 29 00:13 Uname
-rw-r--r-- 1 root root 14 May 29 00:13 ExecutablePath
-rw-r--r-- 1 root root 14 May 29 00:13 ProcCmdline
-rw-r--r-- 1 root root 1 May 29 00:13 ProcCwd
-rw-r--r-- 1 root root 0 May 29 00:13 UserGroups
@ubuntu:/tmp/coretest$ cd CoreDump
bash: cd: CoreDump: Not a directory
@ubuntu:/tmp/coretest$ sudo crash /tmp/vmlinux /boot/System.map-3.2.0-23-generic-pae /tmp/coretest/CoreDump
crash 6.1.6
Copyright (C) 2002-2013 Red Hat, Inc.
Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation
Copyright (C) 1999-2006 Hewlett-Packard Co
Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited
Copyright (C) 2006, 2007 VA Linux Systems Japan K.K.
Copyright (C) 2005, 2011 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions. Enter "help copying" to see the conditions.
This program has absolutely no warranty. Enter "help warranty" for details.
GNU gdb (GDB) 7.3.1
Copyright (C) 2011 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 "i686-pc-linux-gnu"...
crash: /tmp/vmlinux: no debugging data available
@ubuntu:/tmp/coretest$
对于“没有可用的调试数据”，需要按照this link 和这个one 安装一些调试信息包（programname-dbg 或 progname-dbgsym）
问题https://askubuntu.com/questions/197016/how-to-install-a-package-that-contains-ubuntu-kernel-debug-symbols中提到了为内核下载调试信息包的步骤
但是，添加 GPG 密钥的步骤（如下）对于下载工作至关重要
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ECDCAD72428D7C01
你应该收到消息
public key "Ubuntu 调试符号存档自动签名密钥
" 导入
而不是“未更改”状态。如果在此步骤中显示“未更改”，则您将无法下载 debuginfo 包。
在这种情况下，尝试使用 http 80 端口作为 (here) 导入 GPG 密钥
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10