A server can keep answering requests while quietly falling behind on security fixes or waiting for a kernel reboot. Start with the exact machine, distribution and service at hand. A procedure that works in a tutorial may need adjustment before it belongs on a production system.
Why this deserves attention
Linux distributions offer different release schedules, package sources and support windows. Ubuntu’s security documentation is a useful example of how updates are maintained, but commands and support terms should always be checked for the distribution and version in use. A cautious change includes a backup and a way to verify the result. Patch status is an operational task, not just a package manager command; someone must verify the service afterwards. The outcome must be checked after the command runs; an exit code alone does not prove the service is healthy.
A practical way forward
List the supported release and installed sources, schedule updates, and check the application and logs after any restart. Capture the current configuration and arrange a recovery path. Make one change, inspect logs or service behaviour, and only then continue to the next step.
Picture it in a real situation
A small site can reserve a monthly maintenance window and test login, contact forms and scheduled jobs immediately afterwards. A similar symptom on another machine may have a different cause. Keep the relevant log line and configuration change so the result can be verified later.
What to avoid
Avoid assuming every package has the same support commitment or that a successful install proves the application still works. Verify the command for the installed distribution and release. A setting that fixes one server may weaken or break another if applied without context.
Takeaway
Change one thing, verify the service and retain a recovery path. That is the core of dependable maintenance.
Sources and further reading: Ubuntu security updates; Ubuntu Server documentation.