Comment 7 for bug 621837

It makes sense is the user installed apache2 from the archive, tried to tweak its configuration to install e.g a LAMP server by hand, then upgrade.

You can reproduce in lucid with the following steps
$ apt-get install apache2=2.2.14-5ubuntu8 apache2-mpm-prefork=2.2.14-5ubuntu8 apache2.2-common=2.2.14-5ubuntu8 apache2.2-bin=2.2.14-5ubuntu8
$ a2dismod reqtimeout
$ mv /etc/apache2/mods-available/reqtimeout.* /tmp/
$ apt-get upgrade

You'll also notice the error in the logs ".: 45: Can't open /etc/apache2/envvars
", there is a high probability that the apache2 configuration has been modified manually and I think those errors are user errors.

Anyway the version I have verified that the version of apache2 2.2.14-5ubuntu8.3 in -proposed fixes the issue and the installation is not failing anymore.

Marking as verification-done