Comment 2 for bug 514368

As possible additional info...
Found that the install placed the first-level directories and their immediate sub-files in the dist-packages directory, but failed to place any subdirectories within these addons directories. (They do show up in the site-packages though).

For example...
In dist-packages (no subdirectories)...
../addons/account/account.py
../addons/account/account_analytic_line.py
../addons/account/account_assert_test.xml
etc.

In site-packages (includes subdirectories)...
../addons/account/data/account_data2.xml
../addons/account/data/account_invoice.xml
../addons/account/demo/account_minimal.xml
etc.
../addons/account/account.py
../addons/account/account_analytic_line.py
etc.

Experienced this with Ubuntu 9.10 and OpenErp 5.0.9.