Failed to connect to 0.0.31.144: Invalid argument

When trying to install Software on Ubuntu, Debian, CentOS,.. and you have your proxy configured wrong, you may get the following error:

To solve it, open your proxy settings and make sure to also add https, like:

Have a look into the following files (if they exist) and look for proxy settings. It’s important to use tcp:// in front of the proxy host/ip, not http:// and not https:// .

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