For the people who aren't seeing libgles1-sgx-img at all, it's a repository problem, maybe akamai mirrors have regionally slightly different content.

For people who have an older version of libgles1-sgx-img installed it could be also application manager issue. Application Manager is really bad updating packages unless package (and version) is directly in application being installed/updated. Uninstalling libgles1-sgx-img manually and then trying to install gles1 application might work.

Btw I have used libgles1 dependency instead of directly using libgles1-sgx-img, but it doesn't have any effect in this matter.