Fastlane stuck forever when run command fastlane init

Use sudo fastlane init. This fixed the issue for me

https://github.com/fastlane/fastlane/issues/12500

This issue also occurred in my machine once. The problem was with Default Ruby environment. Can you give "gem cleanup" a try and see if that speeds things up for you?

Also, if that doesn't work, can you please try below commands-

gem cleanup
gem update -p
rvm reinstall ruby-2.5.1 --with-openssl-dir=/usr/local
gem install fastlane --verbose