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[Entry]
"Hm, just wanted to put this as a comment to the above answer by @paxdiablo, but cannot find the comment button? Anyways..
The thing is that the vmlinuz file is compressed - and for debugging purposes, you need an uncompressed vmlinux one (and preferably one built with debugging symbols - which the default vmlinuz-es coming with Ubuntu do not have, as they are stripped of symbols).
Now, it is possible to unpack a vmlinuz into a vmlinux file - however, that is not trivial; first you have to find a byte offset in vmlinuz where the compressed file starts, and then use dd and zcat to unpack only the necessary part. In detail, this is explained in: ""[ubuntu] How to trace this bug? - Ubuntu Forums - post #4""; in brief, below is my example terminal command log, based on that post:
$ od -A d -t x1 /boot/vmlinuz-$(uname -r) | grep '1f 8b 08 00' --colour
0013920 f3 a5 fc 5e 8d 83 70 23 3d 00 ff e0 *1f 8b 08 00*
$ wcalc 13920+12
= 13932
$ dd if=/boot/vmlinuz-$(uname -r) bs=1 skip=13932 | zcat > vmlinux-$(uname -r)
4022132+0 records in
4022132+0 records out
4022132 bytes (4,0 MB) copied, 42,1695 s, 95,4 kB/s
gzip: stdin: decompression OK, trailing garbage ignored
$ file vmlinux-2.6.32-25-generic
vmlinux-2.6.32-25-generic: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, stripped
Well, hope this helps,
Cheers!"
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