UCS 3.3 was released after UCS 4.0. This may lead to difficulties in the upgrade process of the system, as some packages (e.g. Samba) are newer in UCS 3.3 than in UCS 4.0. These instructions will help you to upgrade your UCS 3.3 system to a UCS 5 system.
Ensure you’ve backed up your UCS 3.3 system before starting the upgrade to facilitate restoration in case of issues. Execute the commands within a screen session or tmux to avoid interruptions and ensure a seamless upgrade process.
mkdir -p /var/lib/univention-repository/mirror/3.2/maintained/component/ && cd "$_"
wget https://updates.software-univention.de/download/temp/transition.tar --no-check-certificate tar xvf transition.tar
We’ll simulate the current system as UCS 3.2 to ensure that the upgrade process doesn’t mistakenly identify a version higher than 4.0 as currently running:
ucr set repository/online/component/transition=enabled repository/online/component/transition/version=3.2
univention-upgrade --ignoressh --ignoreterm