Fix circle ci

test/packer_basic_example_test.go

@@ -21,6 +21,7 @@ import (
 var DefaultRetryablePackerErrors = map[string]string{
 	"Script disconnected unexpectedly":                                                 "Occasionally, Packer seems to lose connectivity to AWS, perhaps due to a brief network outage",
 	"can not open /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_xenial_InRelease": "Occasionally, apt-get fails on ubuntu to update the cache",
+	"error while running command: exit status 1;":                                      "Occasionally, package installation inside the image seems to fail due to several reasons such as it's being missing from package repository",
 }
 var DefaultTimeBetweenPackerRetries = 15 * time.Second