Bug#358543: Apache Installation Fix
I got apache to install by changing /usr/share/apache/postinst.common.
Around line 183 and following, change the 5 statements like
db_set $pkg/server-name localhost
db_set "$pkg/server-name localhost"
That keeps the space between "server-name" and "localhost" - the error
is because they're getting merged together making the config routine
look for a nonexistent key.
I don't understand enough about debconf to say whether this is a problem
with the postinst.common script or whether something about the db_set
routine changed or subtly broke recently. This is just a workaround.