Add instructions for downloading Linux (Mint)

NAME="Linux Mint"
VERSION="21.2 (Victoria)"
ID=linuxmint
ID_LIKE="ubuntu debian"
PRETTY_NAME="Linux Mint 21.2"
VERSION_ID="21.2"
HOME_URL="https://www.linuxmint.com/"
SUPPORT_URL="https://forums.linuxmint.com/"
BUG_REPORT_URL="http://linuxmint-troubleshooting-guide.readthedocs.io/en/latest/"
PRIVACY_POLICY_URL="https://www.linuxmint.com/"
VERSION_CODENAME=victoria
UBUNTU_CODENAME=jammy

https://www.postgresql.org/download/linux/ubuntu/

wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | 
sudo gpg --dearmor -o /usr/share/keyrings/pgdg-archive-keyring.gpg

sudo su

. /etc/os-release; if [ ! -z ${UBUNTU_CODENAME+x} ]; then 
DIST="${UBUNTU_CODENAME}"; else DIST="$(lsb_release -c| awk '{print 
$2}')"; fi; \
echo "deb [arch=amd64 
signed-by=/usr/share/keyrings/pgdg-archive-keyring.gpg] 
http://apt.postgresql.org/pub/repos/apt ${DIST}-pgdg main" > 
/etc/apt/sources.list.d/${DIST}-pgdg.list

exit

sudo apt-get update

sudo apt -y install postgresql --fix-missing