I checked out your code in more detail: The problem is that "Linux & Unix"
isn't a CriterionUserInterest, it's a
Vertical<https://developers.google.com/adwords/api/docs/appendix/verticals>.
This code's working for me in the sandbox:
$interestId = 736; //Linux & Unix
$interest = new Vertical();
$interest->id = $interestId;
$interest->path = array("Computers & Electronics", "Software", "Operating
Systems", "Linux & Unix");
$campaignCriterion = new NegativeCampaignCriterion();
$campaignCriterion->campaignId = $campaignId;
$campaignCriterion->criterion = $interest;
$operations = array();
$operations[] = new CampaignCriterionOperation($campaignCriterion, 'ADD');
$campaignCriterionService->mutate($operations);
Note that you also need to enter the category path, even though you've
already entered an id.
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