Installation Instructions for Kolab 16 on Debian 8

This article describes the installation procedure for Kolab 16 on Ubuntu 18.04 LTS (Bionic).

Install the APT plugin for HTTPS transport

# aptitude -y install apt-transport-https

Configure the Kolab Software Repositories

Add the following two lines to /etc/apt/sources.list.d/kolab.list:

deb jessie release updates
deb-src jessie release updates

Set the Repository Priority

To ensure the Kolab packages have priority over the Debian packages, such as must be the case for PHP as well as Cyrus IMAP, please make sure the APT preferences pin the origin as a preferred source.

Put the following in /etc/apt/preferences.d/kolab:

Package: *
Pin: origin
Pin-Priority: 501

Install the GPG Signature

Install the public key used to sign the repository metadata with:

# wget -q -O- | apt-key add -

Install Kolab

Update the repository metadata:

# apt-get update

Start the installation of the base package as follows:

# aptitude install kolab

When asked to confirm you want to install the package and its dependencies, press Enter.

NOTE: Depending on your current Debian installation, you may be prompted to confirm the removal of Exim4 in favor of the installation of Postfix, as shown in the following text console output snippet;

The following packages have unmet dependencies:
 postfix : Conflicts: mail-transport-agent which is a virtual package.
 exim4-daemon-light : Conflicts: mail-transport-agent which is a virtual package.
 exim4-config : Conflicts: postfix but 2.11.3-1+deb8u2 is to be installed.
The following actions will resolve these dependencies:

     Remove the following packages:
1)     exim4                       
2)     exim4-base                  
3)     exim4-config                
4)     exim4-daemon-light          

Accept this solution? [Y/n/q/?]

Accept this solution by pressing Enter.

Next steps

Run the script as described in this article.

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