Output of stack.sh

2017-09-19 11:25:11.827 | W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/pgdg.list:1 and /etc/apt/sources.list.d/pgdg.list:2
2017-09-19 11:25:11.827 | W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/pgdg.list:1 and /etc/apt/sources.list.d/pgdg.list:2
2017-09-19 11:25:15.273 | ++ functions-common:apt_get_update:1057     :   die 1057 'Failed to update apt repos, we'\''re dead now'
2017-09-19 11:25:15.278 | ++ functions-common:die:186                 :   local exitcode=0
2017-09-19 11:25:15.282 | [Call Trace]
2017-09-19 11:25:15.282 | ./stack.sh:728:source
2017-09-19 11:25:15.282 | /home/alisha/devstack/tools/install_prereqs.sh:72:install_package
2017-09-19 11:25:15.283 | /home/alisha/devstack/functions-common:1282:update_package_repo
2017-09-19 11:25:15.283 | /home/alisha/devstack/functions-common:1263:apt_get_update
2017-09-19 11:25:15.283 | /home/alisha/devstack/functions-common:1057:die
2017-09-19 11:25:15.291 | [ERROR] /home/alisha/devstack/functions-common:1057 Failed to update apt repos, we're dead now
2017-09-19 11:25:16.385 | Error on exit
2017-09-19 11:25:16.386 | ./stack.sh: line 512: generate-subunit: command not found