Get latest version of apt
sudo apt install wget
sudo apt install unzip
sudo apt-get install dpkg-sig
Copy link from below
example link :https://install.service-now.com/glide/distribution/builds/package/app-signed/mid-linux-installer/2021/07/15/mid-linux-installer.rome-06-23-2021__patch0-07-07-2021_07-15-2021_1403.linux.x86-64.deb
make a new folder with name as mid
/home/varanconsulting3/mid
wget https://install.service-now.com/glide/distribution/builds/package/app-signed/mid-linux-installer/2021/07/15/mid-linux-installer.rome-06-23-2021__patch0-07-07-2021_07-15-2021_1403.linux.x86-64-deb.zip
wget https://install.service-now.com/glide/distribution/builds/package/app-signed/mid-linux-installer/2021/07/15/mid-linux-installer.rome-06-23-2021__patch0-07-07-2021_07-15-2021_1403.linux.x86-64.deb
-rw-r--r-- 1 varanconsulting3 varanconsulting3 344005620 Aug 11 09:12 mid-linux-installer.rome-06-23-2021__patch0-07-07-2021_07-15-2021_1403.linux.x86-64.deb
-rw-rw-r-- 1 varanconsulting3 varanconsulting3 661 Aug 11 09:12 ServiceNow_Digicert_Public.gpg
-rw-r--r-- 1 varanconsulting3 varanconsulting3 871 Aug 11 09:12 mid-linux-installer.rome-06-23-2021__patch0-07-07-2021_07-15-2021_1403.linux.x86-64-deb.zip
unzip mid-linux-installer.rome-06-23-2021__patch0-07-07-2021_07-15-2021_1403.linux.x86-64-deb.zip
gpg --import ServiceNow_Digicert_Public.gpg
gpg: key 985DD52C6A0ABB45: "ServiceNow, Inc. (Signing) <seceng@servicenow.com>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
dpkg-sig --verify mid-linux-installer.rome-06-23-2021__patch0-07-07-2021_07-15-2021_1403.linux.x86-64.deb
Processing mid-linux-installer.rome-06-23-2021__patch0-07-07-2021_07-15-2021_1403.linux.x86-64.deb...
GOODSIG _gpgbuilder 9B928FB49771DF6C047430DD985DD52C6A0ABB45 1628673136
sudo dpkg -I mid-linux-installer.rome-06-23-2021__patch0-07-07-2021_07-15-2021_1403.linux.x86-64.deb
References
https://www.postgresql.org/download/linux/debian/
References : https://docs.servicenow.com/bundle/rome-servicenow-platform/page/product/mid-server/concept/mid-server-installation.html
https://www.cyberciti.biz/faq/how-to-install-wget-togetrid-of-error-bash-wget-command-not-found/
https://www.tecmint.com/wget-download-file-to-specific-directory/
https://linuxize.com/post/how-to-unzip-files-in-linux/
http://manpages.ubuntu.com/manpages/bionic/man1/dpkg-sig.1.html
