You are trying to install Moodle older than 2.9.3/2.8.9 using MySQL 5.7.5 or more recent. That will not work.
See https://tracker.moodle.org/browse/MDL-50633
You have two options:
- Install MySQL older than 5.7.5
- Use more recent version of Moodle.
Installing and upgrading help
Unable to finish moodle instalation
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