Why isn't lo-menubar installed by default in LibreOffice?

Solution 1:

From what I've read, there may be cases where it does not work correctly. For now, at least, it is not enabled by default:

• https://bugs.launchpad.net/lo-menubar/+bug/760879
• https://bugs.launchpad.net/ubuntu/+source/lo-menubar/+bug/739184

Solution 2:

There are still a few rough edges to be worked out in lo-menubar, so until then it will not be installed/enabled by default.

For example, on rare occasions the window opens with the menu inside of it, and then the menu disappears (after a few seconds) and shows up in the unity panel as expected.

Solution 3:

There are still rough edges (as of today and Ubuntu 11.10, version 0.1), especially crashes that only occur when the extension is installed.

As a consequence, you should definitely not install it now.