Update Packages and OS

Run the command to update the installation

sudo apt update && sudo apt upgrade -y

If you are on a laptop

Battery saving

use tlp package for better battery savings

# Install tlp
# More info: https://linrunner.de/tlp/index.html
sudo apt-get install tlp tlp-rdw

# Start tlp
sudo systemctl enable tlp --now

Configure default settings

Timezone

Set timezone and check settings

# Set timezone to Asia/Singapore
sudo timedatectl set-timezone Asia/Singapore

# Check timezone settings
timedatectl

NTP Client

Add NTP server in /etc/systemd/timesyncd.conf file

# Configure ntp server address
sudo sed -i '/^#NTP=/a NTP=ntp.example.com' /etc/systemd/timesyncd.conf
sudo sed -i '/^#FallbackNTP=.*/a FallbackNTP=ntp.ubuntu.com' /etc/systemd/timesyncd.conf

# Restart NTP client service
sudo systemctl restart systemd-timesyncd

# Check NTP client setting is applied
systemctl status systemd-timesyncd

# Check time settings are applied
timedatectl timesync-status

Unattended Upgrade

# Install unattended-upgrades
sudo apt install -y unattended-upgrades

# Testing installation
# In the output, we're interested in seeing if there's any error
sudo unattended-upgrade -d -v --dry-run

# Enabling unattended-upgrades
# Click YES on the warning page
# Configuration can be found at /etc/apt/apt.conf.d/ folder
sudo dpkg-reconfigure --priority=low unattended-upgrades

Sudo without password

sudo visudo

# Add at the end of the line
[username] ALL=(ALL)    NOPASSWD:ALL

Password Requirements

Proceed at your own risk

• Edit /etc/security/pwquality.conf

difok = 0
minlen = 6
dictcheck = 0