I started upgrading my mac to macOS Catalina in 12th Oct. 2019.
I downloaded 8GB and started installing. After starting, I went to bed.
After my getting up, it needed to be rebooted. Then, I waited for completing the install.
Xcode command line tool
I just executed
- macOS Catalina / macOS Mojave / macOS High Sierra / macOS Sierra / OS X El Capitan に付属するヒラギノフォントのセットアップ
brew doctor, I followed the suggestion.
There was no Ruby interpreter except the system. Thus I reinstalled the latest Ruby by
rbenv. I executed
rbenv install 2.6.5.