Hi Vasilis, Please note that this is not a good support channel, but a contact point to reach the developers directly. Many – this question included – can be far better and detailed explained by contributors providing support through dedicated channels. I think you can find more information about the available options at: https://www.ubuntu.com/support/community-support Case in point: I don't have an Ubuntu system, so I can't explain how to do it there, I can at best give general hints as follows if you want to continue on your own, but I would really advice you to get in touch with your supporters! On Wed, Jan 23, 2019 at 09:25:15AM +0000, Vasilis Nikolopoulos wrote: > it seems that there is no apt.conf file under /etc/apt directory. If the file does not exist (which is okay and probably the default) you can create it with a text editor (= not with an office suite tool). Better yet you can create a file in /etc/apt/apt.conf.d/ with a name of your choosing. The syntax of the file(s) is explained by "man apt.conf". > I have changed the Network proxy to "Manual" with the proxy > configuration and the internet access works fine, but i'm unable to > install packages with apt-get cli command. Please advice on the files I have no idea what you mean here as I have no knowledge of the more user-facing parts of the picture, but assuming these tools set the environment variable http_proxy – which apt reacts to as many other commandline tools do – I would check if it is set in your case, so in your shell try: export | grep -i proxy A clean restart (or at least restarting your Terminal application) might very well cause the settings to propagate to the right places. > that need to be created or any other settings required for correct > proxy configuration. Details about apt specific proxy configuration as well as about what apt understands from more generic configuration options is detailed in "man apt-transport-http" (assuming your distributions includes a relatively recent apt version as the manpage is relatively new. In that case you can also read it online through; the options detailed exist for a long time, they were just documented in different places before). If the support channels can't help you or if you run into a bug feel free to get back to us (in the later case, the supporters will even help you create a good actionable bugreport if you need help with that). Best regards David Kalnischkies
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