Bug#454266: upgrade to 2.7 fails, leaving system unusable

[Marcus Better <marcus@better.se>]

>   this looks rotten, on a machine I have access to (an i386):

Seems the file is from version 2.6.1:

~$ md5sum /lib/i686/cmov/libc.so.6
76e00ba611b3bcb7827bd3f4e3b4930f  /lib/i686/cmov/libc.so.6
~$ ls -l /lib/i686/cmov/libc.so.6
lrwxrwxrwx 1 root root 13 2007-08-21 13:05 /lib/i686/cmov/libc.so.6 -> libc-2.6.1.so
~$ dpkg -l libc6-i686
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
un  libc6-i686     <none>         (no description available)

> have you libc6-i686 installed ?

No:

~$ md5sum /lib/i686/cmov/libc.so.6
76e00ba611b3bcb7827bd3f4e3b4930f  /lib/i686/cmov/libc.so.6
marcus@better:~$ ls -l /lib/i686/cmov/libc.so.6
lrwxrwxrwx 1 root root 13 2007-08-21 13:05 /lib/i686/cmov/libc.so.6 -> libc-2.6.1.so
marcus@better:~$ LANG=C dpkg -l libc6-i686
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
un  libc6-i686     <none>         (no description available)