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How to correctly setup Ubuntu 18.04 LTS installed from mini.iso to use NetworkManager?
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What can be the reasons of connection refused errors?
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How to configure proxy authentication to work with Ubuntu Software Center?
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Set Ubuntu System Proxy Settings without Restart from commandline
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How do I get `apt-get update` to work on a machine with no internet access and manually assigned IP address?
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Ubuntu 12.04 APT Proxy?
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Ubuntu 17.04 connected to wifi but can't browse internet
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How to enable Internet Connection Sharing using command line?
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Chrome is unable to connect to the Internet
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In Windows 7, how to change proxy settings from command line?