Judging from the name, this build should not be triggered by a pull request to Github.
Started by upstream project "pull-requests-github_trigger-aggregation" build number 1856
originally caused by:
Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on jenkins-02a33d96-43ab-4c46-b2ed-a463f13a9c4d (stretch-amd64) in workspace /jenkins/workspace/master-build-on-stretch-amd64-with-libstatgrab
[master-build-on-stretch-amd64-with-libstatgrab] $ /bin/sh -xe /tmp/hudson298903252108706092.sh
+ dpkg -l
ERROR: Unable to find project for artifact copy: pull-requests-prepare-tarball
This may be due to incorrect project name or permission settings; see help for project name in job configuration.
Archiving artifacts
Skipping publisher since build result is FAILURE
Finished: FAILURE
Judging from the name, this build should not be triggered by a pull request to Github.