The “do-release-upgrade” command is used to upgrade an Ubuntu system to a new release version. If you are getting a “command not found” error when trying to run the command, it could mean that the package “update-manager-core” is not installed on your system.
Here’s an overview of the steps you’ll need to take:
- Start by running the following command to install the package:
sudo apt-get install update-manager-core
- Once the package is installed, you can run the “do-release-upgrade” command to start the upgrade process.
sudo do-release-upgrade
- Follow the on-screen prompts to complete the upgrade process.
- It is recommended to take a backup of important files before doing the release upgrade.
- It is also recommended to check the release note of the version you are upgrading to, in case there are specific instructions to be followed for the particular version you are upgrading to.
By following these steps, you should be able to run the “do-release-upgrade” command and upgrade your Ubuntu system to a new release version. Keep in mind that upgrading to a new release version can take some time and may require a reboot of your system.