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I think you are working on qpixel. While, working on a big project don't change their version. Just change your ruby version. To change ruby version you have to use `rvm`

```
rvm install 2.6.6
rvm use 2.6.6
```

I think another type of login required in terminal (i forgot). If you can't execute above command normally than, try with `sudo`. I am sure that sudo can't execute them also. So, at first login using

```
/bin/bash --login
```

Then, execute those commands. I hope it will work now.