Comment 2 for bug 260620

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Kjell Braden (afflux) wrote : Re: package twiki 1:4.1.2-3.1ubuntu1 failed to install/upgrade: le sous-processus post-installation script a retourn? une erreur de sortie d'?tat 1

This is because of the module setenvif not being enabled in your apache configuration.
You may be able to work around this issue by running the following commands:

cd /etc/apache2/mods-enabled/
sudo ln -sf ../mods-available/setenvif.load
sudo ln -sf ../mods-available/setenvif.conf