[pkg-horde] Bug#419688: Cannot install imp4

[Paul Waring]

Package: imp4
Severity: important


When I try to install imp4 (apt-get install imp4) I get the following 
error message:

Reading package lists... Done
Building dependency tree... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  imp4: Depends: horde3 (>= 3.1.1) but it is not going to be installed
        Depends: php4-imap but it is not going to be installed or
                 php5-imap but it is not going to be installed
        Depends: php-mail-mime but it is not going to be installed
E: Broken packages

If I try installing the dependencies beforehand, I get similar error 
messages (e.g. when trying to install horde3).

My /etc/apt/sources.list file contains the following lines:

deb http://mirror.bytemark.co.uk/debian/ stable main non-free contrib
deb http://security.debian.org/ stable/updates main non-free contrib

http://packages.debian.org/ lists imp4 in stable and it shows up in an 
apt-cache search request on my machine as well, so I don't think it is a 
problem with the package lists.

-- System Information:
Debian Release: lenny/sid
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.20.3-bytemark-uml-2
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)