Google Chrome proxy settings?

Open a Terminal and type sudo -H nautilus

Type your password then press Ctrl+L and type /usr/share/applications/ and press Enter

Now find google-chrome and right-click on chrome icon and select "Properties".

Next, Add the following option at the end of command text box, there.

--proxy-server="IP proxy Server:port" (ex: --proxy-server="127.0.0.1:8080")

it's look like this (it's the same for Chrome):

close the window and if the chrome browser is still running, then close the browser and restart again. Finally you can use chrome browser with proxy.

--proxy-bypass-list:

If you want to tell google-chrome to NOT use a proxy with specific domains use --proxy-bypass-list command. This command specifies a list of hosts for whom we bypass proxy settings and use direct connections. Ignored if --proxy-auto-detect or --no-proxy-server are also specified. This is a comma-separated list of bypass rules.

Here is List of Chromium Command Line that used in google-chrome too.

Google Chrome and Chromium obey the environment proxy variables (http_proxy, no_proxy, etc.) and the proxies set via gsettings. gsettings comes preinstalled on [XL]ubuntu, so this is one way which doesn't need sudo privileges.

The keys org.gnome.system.proxy.http[s].{host,port,authentication-user,authentication-user} (and similar options for FTP and SOCKS proxies) and the proxy autoconfiguration key org.gnome.system.proxy.autoconfig_url can be used for this:

gsettings set org.gnome.system.proxy.http host "proxy.server.fqdn"
gsettings set org.gnome.system.proxy.http port "3128"

A proxy exception list can be set using the ignore-hosts key:

gsettings set org.gnome.system.proxy ignore-hosts "['localhost', '127.0.0.0/8', '::1', '*.some.domain', '10.0.0.0/8']" 

A no_proxy environment variable would look like:

export no_proxy="localhost,.some.domain,127.0.0.0/8,10.0.0.0/8"
export NO_PROXY="localhost,.some.domain,127.0.0.0/8,10.0.0.0/8"

You can set this in ~/.profile or ~/.pam_environment (without the export).

Just execute below command in terminal

sudo nano /usr/share/applications/google-chrome.desktop

in Command value append below line

--proxy-server="192.168.1.251:8080" 

Change it with your proxy. its example of non - authentication proxy. For a proxy with authentication one should use,

--proxy-server="username:password@proxy_address:port"

For Unity: In "system settings", go to "network" then "network proxy" : you can then set your proxy system wide.

For setting user and password , set it like this : user:password@proxy:port

For Lubuntu , Xubuntu etc...: look this thread How do I set systemwide proxy servers in Xubuntu, Lubuntu or Ubuntu Studio?