Ubuntu/Apt

Debian and Ubuntu package management with apt. Install, update, remove packages, and manage system repositories.

76 commands

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Getting Started

Quick setup and installation

3commands

Packages

Package management

21commands

Services

systemd services

13commands

Users

User management

12commands

System

System operations

17commands

Network

Network & firewall

10commands

Check Ubuntu version

$ lsb_release -a

Display detailed Ubuntu version and distribution information

Update and upgrade packages

$ sudo apt update && sudo apt upgrade -y

Update package lists and upgrade all installed packages

Check system information

$ uname -a

Display kernel version, architecture, and system details

Start service

$ sudo systemctl start <service>

Start a systemd service.

Stop service

$ sudo systemctl stop <service>

Stop a systemd service.

Restart service

$ sudo systemctl restart <service>

Restart a service.

Check service status

$ sudo systemctl status <service>

Show service status.

Enable service on boot

$ sudo systemctl enable <service>

Enable service to start on boot.

Disable service on boot

$ sudo systemctl disable <service>

Prevent a service from starting at boot.

Reload service config

$ sudo systemctl reload <service>

Reload service configuration without full restart.

List all active services

$ systemctl list-units --type=service --state=running

Show all currently running systemd services.

View service logs

$ journalctl -u <service> --since '1 hour ago'

Show recent logs for a specific service.

Follow service logs live

$ journalctl -u <service> -f

Stream live log output for a specific service.

List failed services

$ systemctl --failed

Show all services that have failed to start.

Mask a service

$ sudo systemctl mask <service>

Completely prevent a service from starting, even manually.

Reload systemd daemon

$ sudo systemctl daemon-reload

Reload systemd manager after editing unit files.

Add user

$ sudo adduser <username>

Create a new user with home directory and prompts.

Delete user

$ sudo deluser --remove-home <username>

Delete a user and remove their home directory.

Add user to group

$ sudo usermod -aG <group> <user>

Add user to a supplementary group without removing other groups.

Change password

$ sudo passwd <username>

Change user password.

Show user groups

$ groups <username>

List groups user belongs to.

Edit sudoers file

$ sudo visudo

Safely edit the sudoers file with syntax checking.

Switch to another user

$ su - <username>

Switch to another user with their full login environment.

Lock user account

$ sudo usermod -L <username>

Lock a user account to prevent login.

Unlock user account

$ sudo usermod -U <username>

Unlock a previously locked user account.

Change user login shell

$ sudo usermod -s /bin/zsh <username>

Change the default login shell for a user.

List all system users

$ cut -d: -f1 /etc/passwd | sort

List all user accounts defined on the system.

Show current user info

$ id

Display UID, GID, and groups for the current user.

Apply netplan config

$ sudo netplan apply

Apply network configuration from /etc/netplan/*.yaml files.

Show IP addresses

$ ip addr show

Display all network interfaces and their IP addresses.

Enable UFW firewall

$ sudo ufw enable

Enable the Uncomplicated Firewall.

Allow port through UFW

$ sudo ufw allow <port>/tcp

Allow incoming TCP traffic on a specific port.

Deny port through UFW

$ sudo ufw deny <port>

Block incoming traffic on a specific port.

Show UFW status

$ sudo ufw status verbose

Display firewall rules and current status with details.

Delete UFW rule

$ sudo ufw delete allow <port>/tcp

Remove a previously added firewall rule.

Test netplan config

$ sudo netplan try

Test netplan configuration with automatic rollback on failure.

Show hostname info

$ hostnamectl

Display the current hostname, OS, and architecture details.

Restart networking

$ sudo systemctl restart NetworkManager

Restart the NetworkManager service to apply network changes.

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