Ive been trying to install gitorious for a while now which required ruby and rails etc. Ive finally got rails pages serving but cant finish the installation of gitorious because the gem version is too new.

the error logs say please run 'rake ultrasphinx:configure'

and that gives

rake ultrasphinx:configure
(in /var/www/apps/gitorious)
rake aborted!
uninitialized constant ActiveSupport::Dependencies::Mutex
/var/www/apps/gitorious/Rakefile:10:in `require'
(See full trace by running task with --trace)

From searching google this is beacuse of the wrong gem verison. Cant find a way to down grade it.

apparently sudo gem update --system 1.4.2 should do the trick but ubuntu 10.10 does not like this.

ERROR:  While executing gem ... (RuntimeError)
    gem update --system is disabled on Debian, because it will overwrite the content of the rubygems Debian package, and might break your Debian system in subtle ways. The Debian-supported way to update rubygems is through apt-get, using Debian official repositories.
If you really know what you are doing, you can still update rubygems by setting the REALLY_GEM_UPDATE_SYSTEM environment variable, but please remember that this is completely unsupported by Debian.

So i added export REALLY_GEM_UPDATE_SYSTEM=1 to .bashrc and reloaded it with . ~/.bashrc and still the same. ive tried various forms of setting this environmental variable with no luck.

Ive also been told on #gitorious irc channel to add the file config/initializers/rubygems.rb with the line require "thread" to it. This has done nothing.

EDIT: Just found another way which was rvm install rubygems 1.4.2

and it gave:

Removing old Rubygems files...
Installing rubygems dedicated to ruby-1.8.7-p334...
Retrieving rubygems-1.4.2
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  288k  100  288k    0     0   282k      0  0:00:01  0:00:01 --:--:--  414k
Extracting rubygems-1.4.2 ...
Installing rubygems for /home/ubuntu/.rvm/rubies/ruby-1.8.7-p334/bin/ruby
ERROR: Error running 'GEM_PATH="/home/ubuntu/.rvm/gems/ruby-1.8.7-p334:/home/ubuntu/.rvm/gems/ruby-1.8.7-p334@global:/home/ubuntu/.rvm/gems/ruby-1.8.7-p334@global" GEM_HOME="/home/ubuntu/.rvm/gems/ruby-1.8.7-p334" "/home/ubuntu/.rvm/rubies/ruby-1.8.7-p334/bin/ruby" "/home/ubuntu/.rvm/src/rubygems-1.4.2/setup.rb"', please read /home/ubuntu/.rvm/log/ruby-1.8.7-p334/rubygems.install.log
WARN: Installation of rubygems did not complete successfully.

TL;DR please tell me how to downgrade rubygems on ubuntu 10.10 or upgrade gitorious to work with 1.6.2 gems