Cannot install senrty on-premise on ubuntu 18.04

On-Premise
5

I have fixed the issue, it was a proxy configuration problem,
my company requires proxy setup in order to access internet, i had to configure proxy in 4 location to successfully install sentry:

#1 command line proxy

sudo nano /etc/environment

HTTP_PROXY=http://u:p@x.x.x.x:p
FTP_PROXY=ftp://u:p@x.x.x.x:p
HTTPS_PROXY=https://u:p@x.x.x.x:p
NO_PROXY=localhost,127.0.0.1,::1


#2 apt proxy
	
sudo nano /etc/apt/apt.conf.d/proxy.conf

Acquire::http::Proxy "http://u:p@x.x.x.x:p";
Acquire::https::Proxy "https://u:p@x.x.x.x:p";
Acquire::ftp::Proxy "ftp://u:p@x.x.x.x:p";

#3 proxy for Docker daemon  		
sudo mkdir -p /etc/systemd/system/docker.service.d
sudo nano /etc/systemd/system/docker.service.d/proxy.conf

[Service]
Environment="HTTP_PROXY=http://u:p@x.x.x.x:p"
Environment="FTP_PROXY=ftp://u:p@x.x.x.x:p"
Environment="HTTPS_PROXY=https://u:p@x.x.x.x:p"
Environment="NO_PROXY="localhost,127.0.0.1,::1"

sudo systemctl daemon-reload
sudo systemctl restart docker.service

#4 proxy for Docker Compose  
sudo mkdir -p ~/.docker
sudo nano ~/.docker/config.json

{
 "proxies":
 {
   "default":
   {
     "httpProxy": "http://u:p@x.x.x.x:p",
     "ftpProxy": "ftp://u:p@x.x.x.x:p",
     "httpsProxy": "https://u:p@x.x.x.x:p",
     "noProxy": "localhost,127.0.0.1"
   }
 }
}

hope it helps.