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Bug#727786: CD/USB boot is the only way

On Tue, Nov 12, 2013 at 10:08:05AM -0500, Daniel Genin wrote:
> Just ran into this bug after installing and uninstalling gdb64 (which
> depends on libc6-amd64).
> Having root access does not solve the problem because rm and ln rely on
> libc6
> ~$ ldd /bin/rm
> linux-vdso.so.1 =>  (0x00007fffd578e000)
> libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f37ad8ee000)
> /lib64/ld-linux-x86-64.so.2 (0x00007f37adcd4000)
> Time to dust off that installation DVD or make a new one if you have access
> to another machine.
> I agree that this is an insidious bug for inexperienced users to diagnose
> because
> the system becomes unusable and unbootable.

Indeed. We haven't thought that libc6-amd64 can be installed on an amd64
system (it doesn't bring anything as for gdb64), but the multiarch
specification doesn't provide a way to prevent such a package to be

We are therefore currently working on a solution that allow
libc6-amd64:i386 to be installed without breaking the system.

For already broken systems like yours, here is a procedure to fix it. On
a rescue system, change to the root directory of the system to be fixed.

- make sure ldconfig won't be run anymore: 
    ln -sf /bin/true lib/ldconfig
- point the symlink to the correct libc version:
    ln -sf /lib/x86_64-linux-gnu/libdl-2.13.so lib64/ld-linux-x86-64.so.2
  note that the version 2.13 might have to be adjusted depending on the
  libc currently installed on your system

Then reboot on the system and run the following commands:
- remove libc6-amd64:
    apt-get remove libc6-amd64
- reinstall and/or upgrade at least libc6 and libc-bin:
    apt-get --reinstall libc6 libc-bin

Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net

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