xuej@dev-server:~/Downloads$ curl -sSL https://zipkin.io/quickstart.sh | bash -sThank you for trying Zipkin!This installer is provided as a quick-start helper, so you can try Zipkin outwithout a lengthy installation process.Fetching version number of latest io.zipkin:zipkin-server release...Latest release of io.zipkin:zipkin-server seems to be 2.23.18Downloading io.zipkin:zipkin-server:2.23.18:exec to zipkin.jar...> curl -fL -o 'zipkin.jar' 'https://repo1.maven.org/maven2/io/zipkin/zipkin-server/2.23.18/zipkin-server-2.23.18-exec.jar' % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed100 63.8M 100 63.8M 0 0 79521 0 0:14:01 0:14:01 --:--:-- 153kVerifying checksum...> curl -fL -o 'zipkin.jar.md5' 'https://repo1.maven.org/maven2/io/zipkin/zipkin-server/2.23.18/zipkin-server-2.23.18-exec.jar.md5' % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed100 32 100 32 0 0 45 0 --:--:-- --:--:-- --:--:-- 45> md5sum -c <<< "$(cat zipkin.jar.md5) zipkin.jar"zipkin.jar: OKChecksum for zipkin.jar passes verificationVerifying GPG signature of zipkin.jar...> curl -fL -o 'zipkin.jar.asc' 'https://repo1.maven.org/maven2/io/zipkin/zipkin-server/2.23.18/zipkin-server-2.23.18-exec.jar.asc' % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed100 833 100 833 0 0 220 0 0:00:03 0:00:03 --:--:-- 220GPG signing key is not known, skipping signature verification.Use the following commands to manually verify the signature of zipkin.jar: gpg --keyserver keyserver.ubuntu.com --recv FF31B515 # Optionally trust the key via 'gpg --edit-key FF31B515', then typing 'trust', # choosing a trust level, and exiting the interactive GPG session by 'quit' gpg --verify zipkin.jar.asc zipkin.jarYou can now run the downloaded executable jar: java -jar zipkin.jar