I'm on a Debian 8 Jessie and all was working well at start (well, not really, as you will see soon). This computer has been given to me to install a Moodle test server and create a plugin that will use Flash (I haven't the choice for Flash

Neither Flash nor the update command (just below) was working
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sudo update-flashplugin-nonfree --install
(I get a wget error, a known bug) and the command said to look at this manual. I tried things in the read order and first, I have set http_proxy to a value like http://IP_address:port (unfortunately, I don't remember this value, nor how did I find it). And it didn't work.
After that, I solved the problem by adding an alternative by following what's described at "Manual update" section (but I still have the wget error, so I'll have to update manually each time needed).
Flash was working, internet too.
Today, I started the computer and internet wasn't working anymore. I say internet, but not the connection.
I can install anything in the terminal with the usual apt-get command, but no internet navigator is willing to load any external website.
Note : I'm at the ENSTA (Ecole Nationale Supérieur de Techniques Avancées - Superior National School of Advanced Techniques) of Brest (France) for my internship and they use a proxy server. Thus, we have to set up firefox to "Auto-detect proxy settings for this network" and I don't know this Proxy, but I probably can ask to their informatic service and get the proxy settings.
Note 2 : I tried several cables which worked on my personal computer, nothing changed. I rebooted, then I rebooted again after deleting the line in /etc/apt/apt.conf that was like :
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Acquire::http::http://[[user][:pass]@]host[:port]/
Nothing changed : apt-get install works well, not navigating on the internet.
PS : I use Linux since I'm in high school and I learned a lot by myself but I don't really master any skill on Linux.