All Travis runs are failing for 14.04 / trusty.
Apt fails with the following:
After this operation, 528 MB of additional disk space will be used.
Get:1 https://esm.ubuntu.com/ubuntu/ trusty-infra-security/main libglib2.0-0 amd64 2.40.2-0ubuntu1.1+esm3 [1059 kB]
Err https://esm.ubuntu.com/ubuntu/ trusty-infra-security/main libglib2.0-0 amd64 2.40.2-0ubuntu1.1+esm3
HttpError401
Err https://esm.ubuntu.com/ubuntu/ trusty-infra-security/main libfreetype6 amd64 2.5.2-1ubuntu2.8+esm1
HttpError401