The error message is: Plugin loader python3 was not found
Python3 is installed...
Using Ubuntu 16.04 LTS
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I believe gedit functions via plugins to highlight and console for different languages.
From a quick google search, I found a gedit bug with this comment:
'in /usr/lib/gedit/plugin choice your plugin
for example gemini.plugin
[Plugin] Loader = python
[Plugin] Loader = python3
In some plugins it worked for me'