sudo apt-get install curl openssh-server ca-certificates apt-transport-https perl

sudo apt-get install -y postfix

sudo apt install ca-certificates curl openssh-server postfix tzdata perl

sudo curl -LO https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.deb.sh

sudo bash script.deb.sh 

sudo gitlab-ctl reconfigure
sudo gitlab-ctl start