title: Linux Unsupported proxy configured
body: <p>I'm new in linux, I just started using debian. I tried to install g++, by</p>
  
  <pre><code>apt-get install g++
  </code></pre>
  
  <p>but it didn't work</p>
  
  <pre><code>root@HP:/home/krzysztof# apt-get install g++
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  The following additional packages will be installed:
    g++-6 libstdc++-6-dev
  Suggested packages:
    g++-multilib g++-6-multilib gcc-6-doc libstdc++6-6-dbg libstdc++-6-doc
  The following NEW packages will be installed:
    g++ g++-6 libstdc++-6-dev
  0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
  Need to get 8,516 kB of archives.
  After this operation, 39.8 MB of additional disk space will be used.
  Do you want to continue? [Y/n] Y
  Err:1 http://ftp.pl.debian.org/debian stretch/main amd64 libstdc++-6-dev             amd64 6.3.0-18+deb9u1
    Unsupported proxy configured: 127.0.0.1://8888
  Ign:2 http://ftp.pl.debian.org/debian stretch/main amd64 g++-6 amd64     6.3.0-18+deb9u1
  Err:3 http://ftp.pl.debian.org/debian stretch/main amd64 g++ amd64 4:6.3.0-4
    Unsupported proxy configured: 127.0.0.1://8888
  Err:1 http://security.debian.org/debian-security stretch/updates/main     amd64 libstdc++-6-dev amd64 6.3.0-18+deb9u1
    Unsupported proxy configured: 127.0.0.1://8888
  Err:2 http://security.debian.org/debian-security stretch/updates/main     amd64 g++-6 amd64 6.3.0-18+deb9u1
    Unsupported proxy configured: 127.0.0.1://8888
  E: Failed to fetch http://security.debian.org/debian-    security/pool/updates/main/g/gcc-6/libstdc++-6-dev_6.3.0-18+deb9u1_amd64.deb          Unsupported proxy configured: 127.0.0.1://8888
  E: Failed to fetch http://security.debian.org/debian-    security/pool/updates/main/g/gcc-6/g++-6_6.3.0-18+deb9u1_amd64.deb      Unsupported proxy configured: 127.0.0.1://8888
  E: Failed to fetch http://ftp.pl.debian.org/debian/pool/main/g/gcc-    defaults/g++_6.3.0-4_amd64.deb  Unsupported proxy configured:     127.0.0.1://8888
  E: Unable to fetch some archives, maybe run apt-get update or try with --    fix-missing?
  </code></pre>