Zhipeng, Looks like there is a missing dependency issue with the Ussuri build see the logs [0]. Summary of Errors: Error: Package: httpd24-httpd-tools-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: libaprutil-1.so.0()(64bit) Error: Package: httpd24-httpd-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: system-logos >= 7.92.1-1 Error: Package: httpd24-httpd-tools-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: policycoreutils-python Error: Package: httpd24-httpd-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: libaprutil-1.so.0()(64bit) Error: Package: httpd24-httpd-tools-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: policycoreutils Error: Package: httpd24-runtime-1.1-19.el7.x86_64 (ussuri-wsgi) Requires: scl-utils Error: Package: httpd24-httpd-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: libjansson.so.4()(64bit) Error: Package: httpd24-httpd-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: libapr-1.so.0()(64bit) Error: Package: httpd24-httpd-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: policycoreutils Error: Package: httpd24-httpd-tools-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: libapr-1.so.0()(64bit) Error: Package: rh-python36-runtime-2.0-1.el7.x86_64 (ussuri-wsgi) Requires: scl-utils Error: Package: httpd24-runtime-1.1-19.el7.x86_64 (ussuri-wsgi) Requires: policycoreutils-python Error: Package: httpd24-httpd-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: /etc/mime.types Error: Package: httpd24-httpd-2.4.34-15.el7.x86_64 (ussuri-wsgi) Requires: policycoreutils-python Please take a look into this. Thanks Sau! [0] http://mirror.starlingx.cengn.ca/mirror/starlingx/ussuri/centos/monolithic/2...