I'm having exactly the same problem. Just upgraded to Ubuntu 9.10... Everything was working fine before... Please help ! Thank you !
Message : Tue 05 Jan 2010 11:50:49 PM EST World Community Grid Scheduler request failed: Peer certificate cannot be authenticated with known CA certificates

Ubuntu Karmic Koala 9.10 BOINC install
Greetings,

If you are going to install the BOINC agent using the Package manager please follow these steps. This is for 9.10 of Ubuntu but may apply to other versions of Ubuntu.

(Note: These instructions are only for the GUI version of BOINC. I can give the command line version if needed).
1. Install boinc-client and boinc-manager via the Package Manager in your Systems -> Administration menu at the top.

2. After these install, please go to Applications -> System Tools -> BOINC Manager

3. Follow the steps for setting up your agent. It will require your user name and password you use on the website. When it asks for project, type in http://www.worldcommunitygrid.org

4. Next download the ca-bundle.crt from BOINC. BOINC does not work with World Community Grid without this file. You will get these type of errors if you do not do these next steps.

Thu 29 Oct 2009 04:50:11 PM CDT|World Community Grid|Scheduler request failed: Peer certificate cannot be authenticated with known CA certificates

Download Link -> http://boinc.berkeley.edu/trac/browser/trunk/.../ca-bundle.crt?format=raw

This should download to your "/home/<user>/Downloads/" directory as ca-bundle.crt.

5. Open up a terminal. Applications -> Accessories -> Terminal

6. Copy the ca-bundle.crt to the correct location.

sudo cp Downloads/ca-bundle.crt /var/lib/boinc-client/

7. Go back to your agent and press update to get it to talk with the servers again. It will try to talk after a few minutes if you don't press update.

BOINC should be working after these steps.

Hope this helps,
-Uplinger

Hi

The path to the certificate is not working for me...

Cheers
David

Nothing installs for me at all, and further more my computer shows no program available to to open or install it, in other words, cannot install it on the latest version of Linux Ubuntu, even though the people at world community grid says to follow directions and it will install, I am frustrated.

Hi Onebigpiston,

please do not put the same question in multiple threads... that frustrates me ;O)

Plz see the answer in the other thread you posted and follow there wiht more questions. This thread has nothing at all to do with yours. It's for those that can't get tasks due a specific reason

http://www.worldcommunitygrid.org/forums/wcg/...29013_lastpage,yes#279433

cheers