Linux networking

No internet

Method 1

get network interface

ip a

bring up the interface

sudo ip link set INTERFACE_NAME up
sudo /sbin/dhclient INTERFACE_NAME

try connecting to the internet

ping 1.1.1.1

also check apt sources list

nano /etc/apt/sources.list

ensure sources are there

deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware
deb http://deb.debian.org/debian-security bookworm-security main contrib non-free non-free-firmware
deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware