Ubuntu
update-manager package

while updating by update manager it is showing warning that you are to install can't be authenticated software.

Asked by vivek

It is showing massage before installing updates in Ubuntu 10.4

You are about to install software that can't authenticated Doing this could allow a malicious individual to damage or take control of your system.

Pl. tell me what to do.

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Phil. V (philip.v) said : 		#1

This could be due to third party software sources. Have you added any third party software sources? If you have, it is usually fine to just allow this action, so long as you trust the sources.

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vivek (vvbhirange) said : 		#2

Thank you

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Lachlan Andrew (lachlan-andrew) said : 		#3

I get the same symptom. It isn't only third-party software that is complained about. The packages listed under "NOT AUTHENTICATED" are
 libpam-modules
 libc-bin
 libc6
 libc6-i686
 libc-dev-bin
 libc-dev
 libpam-runtime
 libpam0g
 app-install-data-commercial
 app-install-data-partner
 libatk1.0-0
 gir1.0-atk-1.0
 libatk1.0-data
 libgnome-keyring0
 libgstfarsight0.10-0
 libpng12-0
 thunderbird
 python-farsight

If libpam were actually compromised, I assume that compromises the whole system. We shouldn't encourage people to ignore those warnings!

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Lachlan Andrew (lachlan-andrew) said : 		#4

Oops. (Error between chair and keyboard... I had an invalid proxy setting in my /etc/apt/apt.conf file.)

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marcobra (Marco Braida) (marcobra) said : 		#5

if you need to define a proxy for apt i usually define it into the

/etc/apt/apt.conf.d/proxy

a single row something like this:

Acquire::http::proxy "http://192.168.1.40:3128/";

Better to define it into the /etc/apt/apt.conf.d/proxy
than to put the value in all rows in /etc/apt/sources.list and into /etc/apt/sources.list.d/ files.

Hope this helps