Bug#36578: libc6 downgrade(remove) script doesn't work

[Moricz Ferenc <moricz@math.klte.hu>]

Package: libc6
Version: 2.1.1*

When I want to downgrade my libc6, I receive the following error:

latka:/home/moricz# dpkg -i libc6_2.0.7.19981211-6.deb 
dpkg - warning: downgrading libc6 from 2.1.1-1 to
2.0.7.19981211-6.
(Reading database ... 46519 files and directories currently
installed.)
Preparing to replace libc6 2.1.1-1 (using
libc6_2.0.7.19981211-6.deb) ...
Unpacking replacement libc6 ...
dpkg: warning - old post-removal script killed by signal
(Segmentation fault)
dpkg - trying script from the new package instead ...
dpkg: error processing libc6_2.0.7.19981211-6.deb (--install):
 there is no script in the new version of the package - giving up
dpkg: error while cleaning up:
 subprocess pre-installation script killed by signal
(Segmentation fault)
Errors were encountered while processing:
 libc6_2.0.7.19981211-6.deb

So, it's impossible to get back my old system?