This will install git credential manager core on Ubuntu 22.04 or Ubuntu 20.04
wget "https://github.com/git-ecosystem/git-credential-manager/releases/download/v2.4.1/gcm-linux_amd64.2.4.1.deb" -O /tmp/gcmcore.deb sudo dpkg -i /tmp/gcmcore.deb git-credential-manager configure