How long have you waited? When I install chatterbot in a virtual environment, it can take up to 10 minutes.

I waited for 30 mins

Probably it must be an Memory issue, the virtual env memory for me earlier was 2GB and it maxed out and throwed up error Killed and then increased the memory to 8GB and got successfully installed chatterbot.

ChatterBot should install in less than a minute on most systems. I think the length of time you experienced may be an issue with memory as @Thrillerbuddy suggested, possibly in conjunction with some of the libraries C dependencies such as Spacy trying to build. I've released changes from #2027 that should resolve this installation issue, or at least make is clearer to to which library is actually causing the issue. I hope this change helps.