Thanks that worked. So th script could be improved by writing out the error message and by testing if a libcurl4 is installed.

I wanted to try Domoticz. I went to the website and saw the installation instructions: "curl -sSL install.domoticz.com | sudo bash"
Wow, I thought, this is nice.

The output of the installation script was:
::: Your system is up to date! Continuing with Domoticz installation...
::: Checking for apt ...