CDN: trunk URL couldn't be downloaded:

[!] CDN: trunk URL couldn't be downloaded: https://cdn.cocoapods.org/CocoaPods-version.yml Response: URL using bad/illegal format or missing URL

https://stackoverflow.com/questions/58409725/%D0%A1ocoapods-trunk-url-couldnt-be-downloaded

아래 명령 실행

pod repo remove trunk

그리고 나서.

pod install 아니면 pod update

다른 문제 발생

[!] Unable to add a source with url https://cdn.cocoapods.org/ named trunk.
You can try adding it manually in /Users/jungkukjo/.cocoapods/repos or via pod repo add.

아래 명령 실행
pod repo add-cdn trunk 'https://cdn.cocoapods.org'

[!] CDN: trunk URL couldn't be downloaded: https://cdn.cocoapods.org/CocoaPods-version.yml Response: URL using bad/illegal format or missing URL

다시 동일한 문제 발생 ...

아래 명령 실행
1 sudo gem uninstall cocoapods
2 sudo gem install cocoapods

해결됐다.