To update a Debian or Ubuntu Linux container (lxc) virtual machine (VM), you can use the following steps:
Connect to the container using ssh or another terminal emulator.
Run the following command to update the package lists:
apt update
apt upgrade
This will update all the packages on your container to the latest version available in the package repositories.
If you want to upgrade to a newer version of the Linux distribution, you can use the do-release-upgrade command.
For example, to upgrade from Debian 9 (Stretch) to Debian 10 (Buster), you can use the following command:
apt update apt install apt-transport-https apt upgrade do-release-upgrade
Note that upgrading to a newer version of the Linux distribution can be a complex process and may require additional steps, depending on your system configuration. It's recommended to back up your data and consult the documentation for the new version of the distribution before upgrading.