If someone uses new Ubuntu 18.04 LTS, claymore ends with an error message:
/usr/lib/x86_64-linux-gnu/libcurl.so.4: version `CURL_OPENSSL_3' not found ...
To correct it, just install older version of curl library
sudo apt install libcurl3
But what if libcurl4 is required for other applications installed? I don't have a dedicated mining rig. I use my desktop during off-hours.