Update

Update package list

apt update

Upgrade packages

apt upgrade -y

Upgrade and remove if necessary

apt full-upgrade -y

---

Auto updates

Install needed packages.

apt install -y unattended-upgrades apt-listchanges

Configure updates. By default only security updates are enabled.

vim /etc/apt/apt.conf.d/50unattended-upgrades
---
Unattended-Upgrade::Allowed-Origins {
    [...]
    "origin=Debian,codename=${distro_codename}-updates";
    [...]
}

Enable the timer.

systemctl enable --now apt-daily-upgrade.timer

Check if a reboot is needed.

cat /var/run/reboot-required
---
*** System restart required ***
````

Or use it with a script.

[ -f /var/run/reboot-required ] && reboot

---

# Clean

Remove unused packages

apt autoremove -y

Clean

apt clean

# Repositories

## Manually

echo "deb http://ppa.launchpad.net/ansible/ansible/ubuntu focal main" | tee -a /etc/apt/sources.list.d/ansible.list

## With `apt-add-repository`

apt install software-properties-common apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"

## Download gpg keys

gpg --keyserver keyserver.ubuntu.com --recv-keys 93C4A3FD7BB9C367

---

# Network

## Edit the config

/etc/network/interfaces

---

source /etc/network/interfaces.d/*

auto lo iface lo inet loopback

The primary network interface

allow-hotplug enp1s0 iface enp1s0 inet static address 192.168.1.2 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 1.1.1.1 8.8.8.8 9.9.9.9 pre-up echo "nameserver 1.1.1.1\nnameserver 8.8.8.8\nnameserver 9.9.9.9" > /etc/resolv.conf

## Restart

systemctl restart networking

ifup enp1s0

systemctl restart ifup@enp1s0

---

# Add user

groupadd --gid 1000 --system user useradd --comment "user" --home-dir /var/lib/user --gid 1000 --create-home --system --shell /bin/false --uid 1000 user ```

---

Info

• apt is meant for interactive use, and should not be used in scripts. In scripts one should use apt-get, which has a stable output better suitable for parsing.