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#1: Initial revision by user avatar ArtOfCode‭ · 2021-08-31T21:17:40Z (over 3 years ago)
As the error message says, you can re-run the installation for that single gem to get more detail about the error:

```
gem install mysql2
```

Read the log and any error messages carefully, as they will contain information about what's wrong.

As I mentioned in a comment, you will need various dependencies installed:

```
sudo apt install mysql-server mysql-client libmysqlclient-dev
```