> Following the instructions for "For Precise [Ubuntu 12.04] LTS
> (v3.5.13.1)" from:
>
>  http://www.trinitydesktop.org/wiki/bin/view/Documentation/UbuntuBinaryInstallation.
>
> I got these "Failed to fetch" messages with "apt-get update":
> -----------
> From:
> http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-v3.5.13/ubuntu/dists/quantal/main/
>
> source/Sources
> binary-amd64/Packages
> binary-i386/Packages
>
> Error:  404  Not Found
>
> From:
> http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-builddeps-v3.5.13/ubuntu/dists/quantal/main
>
> /source/Sources
> /binary-amd64/Packages
> /binary-i386/Packages
>
> Error:  404  Not Found
> ----------
>
> I assume this is why I got so many "unmet dependencies" when I tried
> "apt-get install"
<snip>

Why are you attempting to use Quantal repositories?  Check your
/etc/apt/sources.list file and ensure that "precise", not "quantal", is
part of the four TDE lines.

Tim