For Ubuntu 22.04 and Ubuntu 24.04
- Set Hostname
hostnamectl set - hostname mail . example . com- Configure Hosts and Timezone
Edit /etc/hosts
echo "127.0.0.1 localhost " > /etc / hosts
echo "$( hostname -I | awk ’{ print $1 }’) $( hostname -f) $( hostname -s
,→ )" >> /etc/ hosts
cat /etc/ hostsSet Timezone
timedatectl list - timezones # Press "q" to exit
timedatectl set - timezone Asia / Dhaka- Configure Repository
Add Zextras Repository
cat <<EOF >> /etc/apt/ sources . list .d/ zextras . list
deb [ arch = amd64 signed -by =/ usr/ share / keyrings / zextras .gpg] https ://
,→ repo . zextras .io/ release / ubuntu $( lsb_release -cs) main
EOFImport GPG Key
wget -O- " https :// keyserver . ubuntu .com /pks / lookup ?op=get & search =0
,→ x5dc7680bc4378c471a7fa80f52fd40243e584a21 " | \
gpg -- dearmor | sudo tee /usr/ share / keyrings / zextras .gpg > /dev/ null
chmod 644 /usr/ share / keyrings / zextras .gpgDisable IPv6 (Recommended)
echo -e "\ nnet . ipv6 . conf .all . disable_ipv6 = 1\ nnet . ipv6 . conf . default
,→ . disable_ipv6 = 1\ nnet . ipv6 . conf .lo. disable_ipv6 = 1" | \
sudo tee -a /etc / sysctl . conf > /dev / null && sudo sysctl -p