GDB no such file or directory

I’m following these lessons from OpenSecurityTraining.

I’ve reached the lab part where I’ve to train myself on a CMU Bomb. They provide a x86_64 compiled CMU Bomb that you can find here to train on : CMU Bomb x86-64 originally from a 32-bit bomb from CMU Labs for Computer Systems: A Programmer’s Perspective (CS:APP) 1st edition.

I had a virtualized 64 bits Elementary OS distribution where I disassembled the CMU Bomb without problems using GDB. Now, I’ve a 64 bits Ubuntu 14.04 LTS (not virtualized) and when I try to reproduce why I did on my Elementary OS, I get the famous error.

I run these commands :

gdb ./bomb-x64
(gdb) b main
Breakpoint 1 at 0x400dbd: file bomb.c, line 37. -- why bomb.c ?
(gdb) r
bomb.c: no such file or directory

Edit : I can create breakpoints on others functions of the CMU Bomb and it works as expected.
Example :

(gdb) b phase_1
Breakpoint 3 at 0x400f00
(gdb) r

Breakpoint 1, 0x0000000000400f00 in phase_1 ()
(gdb) disas
Dump of assembler code for function phase_1:
=> 0x0000000000400f00 <+0>: sub    $0x8,%rsp
   0x0000000000400f04 <+4>: mov    $0x4023b0,%esi
   0x0000000000400f09 <+9>: callq  0x401308 <strings_not_equal>
   0x0000000000400f0e <+14>:    test   %eax,%eax
   0x0000000000400f10 <+16>:    je     0x400f17 <phase_1+23>
   0x0000000000400f12 <+18>:    callq  0x40140a <explode_bomb>
   0x0000000000400f17 <+23>:    add    $0x8,%rsp
   0x0000000000400f1b <+27>:    retq   
End of assembler dump.

I’ve heard of ia32-libs but this doesn’t do anything more since I’m on 64bits Ubuntu and run a 64bits compiled CMU Bomb, am I wrong ?

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