Bug#517053: fails kernel version check during postrm

[Yuri D'Elia <wavexx@users.sf.net>]

Package: libc6
Version: 2.9-3
Severity: important

Preparing to replace libc6 2.7-10 (using .../archives/libc6_2.9-3_i386.deb) ...
Checking for services that may need to be restarted...
Checking init scripts...
Unpacking replacement libc6 ...
FATAL: kernel too old
dpkg: warning - old post-removal script returned error exit status 1
dpkg - trying script from the new package instead ...
FATAL: kernel too old
dpkg: error processing /var/cache/apt/archives/libc6_2.9-3_i386.deb (--unpack):
 subprocess new post-removal script returned error exit status 1
FATAL: kernel too old
dpkg: error while cleaning up:
 subprocess pre-installation script returned error exit status 1

$ uname -r  
2.6.23.1-bytemark-uml

Shouldn't MIN_KERNEL_SUPPORTED be 2.6.18?