ruby on rails - Unable to start Mongrel (or Passenger) on Debian due to mysql2 or mysql gems -

i posted @ super user, think should here instead...

i'm trying port ror webapp on dreamhost vps. i've upgraded vps --> ruby 1.9.2 1.8.7 , using rails 3.0.1 , mysql2 (0.2.6) gem. i'm getting following error when trying start mongrel:

/usr/bin/ruby1.8: symbol lookup error: /home/username/.gems/gems/mysql2-0.2.6/lib/mysql2/mysql2.so: undefined symbol: rb_intern2

...so tried using mysql (2.8.1) gem instead , following error:

wrong argument type mysql (expected struct) (typeerror)

0 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/mysql_adapter.rb 600 in real_connect'
1 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/mysql_adapter.rb 600 inconnect'
2 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/mysql_adapter.rb 164 in initialize'
3 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/mysql_adapter.rb 36 innew'
4 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/mysql_adapter.rb 36 in mysql_connection'
5 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb 230 insend'
6 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb 230 in new_connection'
7 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb 238 incheckout_new_connection'
8 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb 194 in checkout'
9 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb 190 inloop'
10 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb 190 in checkout'
11 /usr/lib/ruby/1.8/monitor.rb 242 insynchronize'
12 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb 189 in checkout'
13 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb 96 inconnection'
14 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb 318 in retrieve_connection'
15 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_specification.rb 97 inretrieve_connection'
16 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_specification.rb 89 in connection'
17 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/associations.rb 1804 increate_has_and_belongs_to_many_reflection'
18 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/associations.rb 1411 in has_and_belongs_to_many'
19 /home/username/.gems/gems/activerecord-3.0.1/lib/active_record/autosave_association.rb 137 inhas_and_belongs_to_many'
20 /home/username/portfoliofinearts.ca/farr/app/models/project.rb 3
21 /home/username/.gems/gems/activesupport-3.0.1/lib/active_support/dependencies.rb 239 in require'
22 /home/username/.gems/gems/activesupport-3.0.1/lib/active_support/dependencies.rb 239 inrequire'
23 /home/username/.gems/gems/activesupport-3.0.1/lib/active_support/dependencies.rb 227 in load_dependency'
24 /home/username/.gems/gems/activesupport-3.0.1/lib/active_support/dependencies.rb 239 inrequire'
25 /home/username/.gems/gems/activesupport-3.0.1/lib/active_support/dependencies.rb 346 in require_or_load'
26 /home/username/.gems/gems/activesupport-3.0.1/lib/active_support/dependencies.rb 300 independ_on'
27 /home/username/.gems/gems/activesupport-3.0.1/lib/active_support/dependencies.rb 216 in require_dependency'
28 /home/username/.gems/gems/railties-3.0.1/lib/rails/engine.rb 138 ineager_load!'
29 /home/username/.gems/gems/railties-3.0.1/lib/rails/engine.rb 137 in each'
30 /home/username/.gems/gems/railties-3.0.1/lib/rails/engine.rb 137 ineager_load!'
31 /home/username/.gems/gems/railties-3.0.1/lib/rails/engine.rb 135 in each'
32 /home/username/.gems/gems/railties-3.0.1/lib/rails/engine.rb 135 ineager_load!'
33 /home/username/.gems/gems/railties-3.0.1/lib/rails/application.rb 108 in eager_load!'
34 /home/username/.gems/gems/railties-3.0.1/lib/rails/application/finisher.rb 41
35 /home/username/.gems/gems/railties-3.0.1/lib/rails/initializable.rb 25 ininstance_exec'
36 /home/username/.gems/gems/railties-3.0.1/lib/rails/initializable.rb 25 in run'
37 /home/username/.gems/gems/railties-3.0.1/lib/rails/initializable.rb 50 inrun_initializers'
38 /home/username/.gems/gems/railties-3.0.1/lib/rails/initializable.rb 49 in each'
39 /home/username/.gems/gems/railties-3.0.1/lib/rails/initializable.rb 49 inrun_initializers'
40 /home/username/.gems/gems/railties-3.0.1/lib/rails/application.rb 134 in initialize!'
41 /home/username/.gems/gems/railties-3.0.1/lib/rails/application.rb 77 insend'
42 /home/username/.gems/gems/railties-3.0.1/lib/rails/application.rb 77 in method_missing'
43 /home/username/mydomain.com/test_app/config/environment.rb 10
44 /usr/lib/ruby/1.8/rubygems/custom_require.rb 31 ingem_original_require'
45 /usr/lib/ruby/1.8/rubygems/custom_require.rb 31 in require'
46 config.ru 3
47 /usr/lib/ruby/gems/1.8/gems/rack-1.2.1/lib/rack/builder.rb 46 ininstance_eval'
48 /usr/lib/ruby/gems/1.8/gems/rack-1.2.1/lib/rack/builder.rb 46 in initialize'
49 config.ru 1 innew'
50 config.ru 1

i'd prefer use mysql2, that's preferred solution i'm looking for, appreciate input on either problem.

i'm not encountering problems such in development environment (which windows)

you'd mentioned you're running ruby 1.9.2 error dump looks it's running ruby 1.8 i'm not sure cause problem or not seems potential issue.

i'd uninstall ruby1.8 , see if fixes anything.

sudo apt-get remove ruby1.8