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Usually but not always when I try to download some few software through apt I have plenty of errors in the error log such as the following one:

Err http://fr.archive.ubuntu.com trusty/universe Translation-fr                
  Unable to connect to 192.168.1.254:3128:

Or also

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg  Unable to connect to 192.168.1.254:3128:

Some said it was because of a proxy, but I don't use a proxy.

I did: 

:~$ apt-config dump acquire::http
Acquire::http "";
Acquire::http::proxy "http://192.168.1.254:3128/";

and

:~$ grep 192.168.1.254 /etc/apt/ -R
/etc/apt/apt.conf:Acquire::http::proxy "http://192.168.1.254:3128/";
/etc/apt/apt.conf:Acquire::https::proxy "https://192.168.1.254:3128/";
/etc/apt/apt.conf:Acquire::ftp::proxy "ftp://192.168.1.254:3128/";
/etc/apt/apt.conf:Acquire::socks::proxy "socks://192.168.1.254:3128/";
grep: /etc/apt/trustdb.gpg: Permission denied
Revolucion for Monica
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    Please [edit] your post to include the output of apt-config dump acquire::http and grep 192.168.1.254 /etc/apt/ -R. – muru May 16 '16 at 21:53

1 Answers1

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As can be seen from the output, you are using a proxy. Remove that configuration if you don't want it:

sudo sed -i '/192.168.1.254:3128/d' /etc/apt/apt.conf
muru
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  • Thanks! I don't know why it was there... It seems useless as it impeded me to do hoses updates. I removed it, anyway to put it again if ever needed and do those updates through it too? – Revolucion for Monica May 16 '16 at 22:03
  • You can edit /etc/apt/apt.conf and put the lines back as you see in the output here. http://askubuntu.com/questions/257290/configure-proxy-for-apt – muru May 16 '16 at 22:04