Issue with Jcloud Ruby Installation on Ubuntu

Hi while running chef solo on my VM,
ruby is not installed.
here are the logs.
please check:after ruby gems are saved,ruby is not found

Reading state information...
, error=E: Unable to locate package libruby-extras
E: Unable to locate package libruby1.8-extras
E: Couldn't find any package by regex 'libruby1.8-extras'
-2013-05-11 16:42:11- http://production.cf.rubygems.org/rubygems/rubygems-1.3.7.tgz
Resolving production.cf.rubygems.org (production.cf.rubygems.org)... 54.240.168.202, 54.240.168.222, 54.240.168.58, ...
Connecting to production.cf.rubygems.org (production.cf.rubygems.org)|54.240.168.202|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 290986 (284K) [application/octet-stream]
Saving to: `rubygems-1.3.7.tgz'

0K .......... .......... .......... .......... .......... 17% 178K 1s
50K .......... .......... .......... .......... .......... 35% 463K 1s
100K .......... .......... .......... .......... .......... 52% 489K 0s
150K .......... .......... .......... .......... .......... 70% 514K 0s
200K .......... .......... .......... .......... .......... 87% 513K 0s
250K .......... .......... .......... .... 100% 520K=0.8s

2013-05-11 16:42:12 (378 KB/s) - `rubygems-1.3.7.tgz' saved [290986/290986]

/tmp/jclouds-script-1368270686358/jclouds-script-1368270686358.sh: line 25: ruby: command not found
/tmp/jclouds-script-1368270686358/jclouds-script-1368270686358.sh: line 28: /usr/bin/gem: No such file or directory
/tmp/jclouds-script-1368270686358/jclouds-script-1368270686358.sh: line 41: chef-solo: command not found
, exitStatus=127}