While testing Debian Edu Buster I noticed that gosa failed to install due to the reported bug. As gosa hasn't seen a new version recently, I guess the failure might be due to a recently updated dependency (or even a chain of those). As far as I was able to find out, the missing function imageCreateFromPng() should be provided by php-gd. But also that package doesn't seem to have been updated recently.
Wolfgang
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