Hi, you need to install libcurl3 instead.

Btw, anyone else notice a performance hit from 1.20? I seem to have had less MH/S and one of my gpu's crashed twice since using 1.21. Also, there seems to be missing a -t (thread) option now. But it seems like it's automatically recognizing the # of gpu's being used. Just wish this was stated for the updates!
 I haven't underclocked or touched any of the speeds and running linux on nvidia 390.48 drivers with cuda 9.1. I still think 1.20 is terrific as it is!