If you wish to upgrade the Ubuntu system the CES is based on, there is now a short manual for it:
# Upgrading from Ubuntu 18.04 to 20.04
## 1. Upgrade Ubuntu 18.04 to 20.04
You can upgrade the Ubuntu distribution the Cloudogu EcoSystem is built on just like in any other Ubuntu based system. A good reference about the steps to take can be found here: https://www.linuxcloudvps.com/blog/how-to-update-your-server-from-ubuntu-18-04-to-ubuntu-20-04/
## 2. Adjust apt configuration
After you have upgraded your EcoSystem to Ubuntu 20.04, you have to adapt some of the EcoSystem-specific apt configuration:
- Adjust the file `/etc/apt/sources.list.d/ces.list` from 18.04 (bionic) to 20.04 (focal)
- Insert this line: `deb [arch=amd64] https://apt.cloudogu.com/ces/ focal main`
- Remove old lines like `deb [arch=amd64] https://apt.cloudogu.com/ces/ bionic main`
- Adjust the file `/etc/apt/sources.list.d/docker.list` from 18.04 (bionic) to 20.04 (focal)
- Insert this line: `deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable`
- Remove old lines like `deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable`
- Adjust the file `/etc/apt/sources.list.d/hashicorp.list` from 18.04 (bionic) to 20.04 (focal)
- Insert this line: `deb [arch=amd64] https://apt.releases.hashicorp.com focal main`
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If you don’t wish to upgrade to Ubuntu 20.04, you can use Ubuntu 18.04 based EcoSystem instances until the end-of-life of Ubuntu 18.04, which is expected in April 2023.
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