Jenkins build is unstable: raring-server-ec2-daily » amd64,ap-southeast-1,instance-store,simple-user-data,ubuntu-server-ec2-testing #8

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See <http://10.189.74.2:8080/job/raring-server-ec2-daily/./ARCH=amd64,REGION=ap-southeast-1,STORAGE=instance-store,TEST=simple-user-data,label=ubuntu-server-ec2-testing/8/>