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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesTo administer Ubuntu Linux, use a normal account with sudo for privileged tasks, keep package updates separate from release upgrades, and make changes in a way you can recover from. This guide is aimed at administrators of an Ubuntu Server LTS installation using its terminal; Ubuntu Desktop uses different networking tools. Ubuntu’s server documentation targets the latest LTS, so check your installed release with cat /etc/os-release and verify release-specific instructions before changing a production system.
How do I add a user and give them sudo access on Ubuntu?
Ubuntu disables direct administrative root login by default. For routine administration, sign in as a named account and use sudo when a task needs elevated privileges. Authorized users authenticate with their own password, which makes it easier to limit and attribute administrative access than sharing a root login.
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Create a local account
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Create the account and set its password when prompted:
sudo adduser sam. Replacesamwith the intended login name. The command also prompts for optional account details.What’s actually slowing this PC down?
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If the person needs administrative privileges, add the account to the
sudogroup:sudo usermod -aG sudo sam. The-aoption appends the group; omitting it can replace the user’s existing supplementary groups. -
Have the user start a new login session, then check membership with
groups sam. They can test authorization withsudo -v, which prompts for their password if needed.
Grant sudo only when a person’s duties require it. Do not edit /etc/passwd or related identity files by hand as a beginner method. These steps apply to local accounts: accounts managed through LDAP, Active Directory, Samba, or another NSS identity source require that system’s own account-management procedure.
How do I update Ubuntu from the terminal?
Package maintenance and upgrading to a different Ubuntu release are separate jobs. The first updates packages within the installed release; the second changes the operating-system release and needs its own planning. Confirm the release and workload before scheduling either operation.
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Refresh the local package index:
sudo apt update. This retrieves current package information; it does not install updates by itself. -
Review and install available package updates:
sudo apt upgrade. Read the proposed changes before confirming, especially on a production server. -
If APT reports that some packages require dependency changes, review what a full upgrade would remove or install before choosing
sudo apt full-upgrade. It may remove packages to resolve dependency changes, so do not treat it as a blind substitute for every routine upgrade.
For a production workload, test updates where practical and choose a maintenance window that fits the service’s availability requirements. Some updates may require restarting services or the machine; check the package and system notices rather than assuming that an update has taken effect without interruption.
Choose manual or automatic package updates
Ubuntu’s documented default setup includes unattended-upgrades, with security updates enabled and the job running daily. Actual behavior can vary with release and configuration. Check the installed system’s configuration and logs before relying on automatic updates, and decide whether automatic application fits your testing and maintenance policy. This setting concerns package updates, not an automatic move to a new Ubuntu release.
Plan a release upgrade separately
Before moving to another Ubuntu release, confirm that the target release is supported for your installation and that your applications, repositories, and recovery plan are ready. Ubuntu documents release upgrades separately from package updates. Do not use apt upgrade as a release-upgrade procedure; follow the release-specific Ubuntu instructions for the source and target releases instead.
How do I check and restart a service in Ubuntu?
Ubuntu uses systemd to manage services. The service name is package-specific, so confirm it from the package documentation or service’s own instructions rather than guessing.
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Inspect whether a service is active:
systemctl status SERVICE.Recommended Free Tools
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Ask systemd to restart it:
sudo systemctl restart SERVICE. -
Check its state again:
systemctl status SERVICE. If it did not start, inspect the reported error and service logs before making additional changes.
Replace SERVICE with the actual unit name, such as a package’s documented service unit. A restart can interrupt users or connections, so consider the service’s impact before doing it on a live system.
Change service settings without fighting package updates
Use the configuration method documented for the specific package. Package-managed files can be changed by package updates, and Ubuntu documents systemd drop-in overrides as a way to customize service behavior without editing the vendor’s unit file directly. The appropriate configuration file or override depends on the service; check its documentation first, then review the resulting configuration and service status after applying a change.
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First identify which system and tool own the network configuration. Ubuntu Server uses Netplan as a high-level YAML configuration layer; the underlying renderer and installation setup matter. Ubuntu Desktop networking is managed through NetworkManager and follows a different configuration path. Do not apply Server instructions to Desktop by assumption.
Inspect the current network before changing it
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Check release and system identity with
cat /etc/os-release. -
List interfaces and assigned addresses with
ip addr. -
Inspect routes with
ip route. -
Check resolver information with
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For Server, inspect the Netplan configuration under
/etc/netplan/and determine which renderer is in use before editing. For Desktop, use NetworkManager’s supported settings instead.
Make remote changes with a recovery path
A mistaken address, route, or DNS change can sever the very connection you are using to administer the machine. Before changing a remote server, arrange local console or out-of-band recovery access where feasible, preserve a copy of the current configuration, and plan how to restore it. Check the Netplan commands and behavior against the installed release before applying a change; do not assume every machine uses the same renderer or configuration.
Ubuntu’s Server networking guidance describes Chrony as the default time-synchronization service in its Server context; timedatectl and timesyncd are alternatives. Check what is installed and active on the target machine before changing time synchronization, since service ownership and configuration can differ.
How should I secure an Ubuntu system?
Security is a set of layers, not a single command or universal firewall recipe. Build the baseline around current software, limited privilege, protected remote access, and controls that match the services the machine actually exposes.
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Keep software maintained. Apply package updates under a schedule appropriate to the workload, and know whether updates are manual or unattended.
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Limit administrative access. Use named accounts, give sudo only to people who need it, and avoid direct root login as a normal workflow.
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Protect remote administration. Use SSH for secure remote access and review the SSH configuration and authentication policy appropriate to your environment.
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Use a firewall that matches exposure. Decide which services must be reachable and from where before creating rules. A rule set suitable for one server can block required access or expose the wrong service on another; verify the active firewall and rules before relying on them.
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Understand AppArmor. Ubuntu uses AppArmor to limit what software can access. Treat it as one layer of confinement, not a replacement for updates, account controls, or network policy.
Advanced authentication, certificate management, VPN deployment, and centrally managed identities each need procedures tailored to the organization and service; they are beyond a basic administration checklist.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do I back up an Ubuntu server?
A backup is useful only if it covers the data and system state you need and can be restored. Decide what to protect, how often to copy it, where copies will live, and how recovery will work. Keep important backup media off-site; removable hard drives are one possible physical destination, but a local copy alone does not provide off-site protection.
Choose a backup approach that fits the system
Ubuntu’s documentation names Bacula for multi-system network backups and rsnapshot for periodic local or remote snapshots over SSH on a single system. They are examples, not universal recommendations. Compare candidate approaches by deployment scale, automation, encryption, incremental behavior, complexity, storage location, and restore procedure. A custom shell script may suit a narrow task, but it also leaves you responsible for scheduling, error reporting, retention, and recovery checks.
Make restoration part of the plan
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List the files, databases, configuration, and other state the service needs to recover; do not assume that copying a few obvious directories captures everything.
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Set a frequency and retention policy based on how much data you can afford to lose and how far back you may need to recover.
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Keep copies in a separate location, including an off-site copy for important data, and restrict access to backup media.
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Test restoring representative files or a system in a safe environment. Confirm that the restored service works, not merely that a backup job completed successfully.
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What should I troubleshoot first?
Start with the narrowest evidence for the symptom, then change one thing at a time. This makes it easier to distinguish a package problem from a service failure or a network issue.
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A service is unavailable: check
systemctl status SERVICE, then read the error it reports and the service’s own logs or documentation. -
A package operation fails: note the exact APT error and inspect what packages or dependencies it proposes to change before retrying with a more disruptive operation.
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A remote host is unreachable after a network change: use the planned console or recovery path; verify interface addresses, routes, DNS, and the active configuration owner before making another change.
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A machine needs recovery: use the documented restore process and confirm data and service integrity, rather than assuming a successful copy is sufficient.
These tasks are a foundation, not coverage of every server role. Databases, directory services, containers, virtualization, high availability, and advanced observability each introduce additional design and maintenance requirements.
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