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json.net has key method?
...rtyName) has been made as public method in 11.0.1 release
Documentation - https://www.newtonsoft.com/json/help/html/M_Newtonsoft_Json_Linq_JObject_ContainsKey.htm
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...tp://<user>:<pwd>@<proxy_url>:<port_number>
export https_proxy=http://<user>:<pwd>@<proxy_url>:<port_number>
Run the add-apt-repository command again as sudo with the -E option that preserves the user environment:
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