Eu não tenho um arquivo de autoconfiguração de proxy (PAC) para testar isso, mas acho que os seguintes comandos devem funcionar:
gsettings set org.gnome.system.proxy autoconfig-url 'http://pol*************.edu.au/b***.p**'
gsettings set org.gnome.system.proxy mode auto
As descrições desses campos:
org.gnome.system.proxy mode
:
Select the proxy configuration mode. Supported values are "none",
"manual", "auto".
If this is "none", then proxies are not used.
If it is "auto", the autoconfiguration URL described by the
"autoconfig-url" key is used.
If it is "manual", then the proxies described by
"/system/proxy/http", "/system/proxy/https",
"/system/proxy/ftp" and "/system/proxy/socks" will be used.
Each of the 4 proxy types is enabled if its "host" key is
non-empty and its "port" key is non-0.
If an http proxy is configured, but an https proxy is not,
then the http proxy is also used for https.
If a SOCKS proxy is configured, it is used for all protocols,
except that the http, https, and ftp proxy settings override
it for those protocols only.
org.gnome.system.proxy autoconfig-url
:
URL that provides proxy configuration values. When mode is
"auto", this URL is used to look up proxy information for all
protocols.