When updating .deb package shipped by Gandi from an older version and if your system is running a Debian Lenny, you could have errors disabling the correct package update process.

Example of error message

Preparing to replace gandi-hosting-agent-plugins-internal-unix 1.0.0-r1623 (using .../gandi-hosting-agent-plugins-internal-unix_1.0.0-r2429_all.deb) ...
Unpacking replacement gandi-hosting-agent-plugins-internal-unix ...
Usage: update-python-modules [-v] [-c] package_directory [...]
             update-python-modules [-v] [-c] package.dirs [...]
             update-python-modules [-v] [-a|-f|-p]
 
update-python-modules: error: Trying to overwrite gandi/hosting/agent/AgentConfig.py which is already provided by /usr/share/python-support/gandi-hosting-agent
dpkg: warning - old post-removal script returned error exit status 2
dpkg - trying script from the new package instead ...
dpkg: error processing /var/cache/apt/archives/gandi-hosting-agent-plugins-internal-unix_1.0.0-r2429_all.deb (--unpack):
 there is no script in the new version of the package - giving up

Due to method changing in Python file managment, the update-python-modules command fail when updating. To fix the problem, simply add an echo in the correct place (see below) in the postrm files.

        cd /var/lib/dpkg/info
        vim gandi-hosting-agent-plugins-internal-unix.postrm

Change :

        if [ -d /usr/share/python-support/gandi-hosting-agent/ ] && \
            which update-python-modules >/dev/null 2>&1; then
            update-python-modules -c -i /usr/share/python-support/gandi-hosting-agent/
            update-python-modules -i /usr/share/python-support/gandi-hosting-agent/
        fi

with : (just add echo in front of the call of update-python-modules)

        if [ -d /usr/share/python-support/gandi-hosting-agent/ ] && \
            which update-python-modules >/dev/null 2>&1; then
            echo update-python-modules -c -i /usr/share/python-support/gandi-hosting-agent/
            echo update-python-modules -i /usr/share/python-support/gandi-hosting-agent/
        fi

Packages should be in incomplete installation state. You will be able to configure them correctly with :

        aptitude safe-upgrade

And then resune the previous update process with your previous command which trigger the error.