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From: kgthegreat on 27 Mar 2010 04:58
Hello,

I am on Ubuntu 9.10
I ran the following commands for a rubygems update from 1.3.5 to 1.3.6

$ sudo gem install update_rubygems
$ cd /var/lib/gems/1.8/bin
$ sudo ./update_rubygems
$ gem -v
1.3.6

but after this some of the installed gems fail to work . For eg.

$ rails -v
/usr/local/lib/site_ruby/1.8/rubygems.rb:777:in
`report_activate_error': Could not find RubyGem rails (>= 0)
(Gem::LoadError)
from /usr/local/lib/site_ruby/1.8/rubygems.rb:211:in `activate'
from /usr/local/lib/site_ruby/1.8/rubygems.rb:1056:in `gem'
from /var/lib/gems/1.8/bin/rails:18

What is wrong here?
From: Eric Hodel on 31 Mar 2010 23:14
On Mar 27, 2010, at 02:00, kgthegreat wrote:
Hello,
>
> I am on Ubuntu 9.10
> I ran the following commands for a rubygems update from 1.3.5 to 1.3.6
>
> $ sudo gem install update_rubygems
> $ cd /var/lib/gems/1.8/bin
> $ sudo ./update_rubygems
> $ gem -v
> 1.3.6

Had you run `gem update --system` it would have said something like "don't do that" because you (probably) have debian/ubuntu RubyGems installed.

> but after this some of the installed gems fail to work . For eg.
>
> $ rails -v
> /usr/local/lib/site_ruby/1.8/rubygems.rb:777:in
> `report_activate_error': Could not find RubyGem rails (>= 0)
> (Gem::LoadError)
> from /usr/local/lib/site_ruby/1.8/rubygems.rb:211:in `activate'
> from /usr/local/lib/site_ruby/1.8/rubygems.rb:1056:in `gem'
> from /var/lib/gems/1.8/bin/rails:18
>
> What is wrong here?

ubuntu/debian RubyGems and standard RubyGems disagree with each other. Now that you've installed standard RubyGems you'll need to set the GEM_HOME environment variable to /var/lib/gems/1.8, I think

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