Landscape client failed to upgrade

[Free Ekanayaka]

While upgrading landscape-client from trunk on lds.beret.net, I got:

Setting up landscape-client (11.11~bzr456-0ubuntu0~lucid1) ...
Usage: landscape-config [options]

landscape-config: error: option --exchange-interval: invalid integer value: ''
dpkg: error processing landscape-client (--configure):
 subprocess installed post-installation script returned error exit status 2
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Errors were encountered while processing:
 landscape-client
E: Sub-process /usr/bin/dpkg returned an error code (1)

[Free Ekanayaka (free.ekanayaka)]

It seems to be due to this new line in

        if [ -f $CONFIG_FILE ]; then
            mv --backup=numbered $CONFIG_FILE $CONFIG_FILE.bak
        fi

which always makes landscape-client regenerate the config file.

[Free Ekanayaka (free.ekanayaka)]

The new line is the postinst script.