This issue exists on eric 4.3.7.1, which is the current version for karmic.
The problem appears to be due to the following line in line 4227 of /usr/share/eric/modules/UI/UserInterface.py:
home = '/usr/share/doc/python2.5-doc/html/index.html'
Clearly this is a hard-coded path, and it is overriding the value that the code earlier pulls from preferences. Commenting out this line fixed the problem for me.
This issue exists on eric 4.3.7.1, which is the current version for karmic.
The problem appears to be due to the following line in line 4227 of /usr/share/ eric/modules/ UI/UserInterfac e.py:
home = '/usr/share/ doc/python2. 5-doc/html/ index.html'
Clearly this is a hard-coded path, and it is overriding the value that the code earlier pulls from preferences. Commenting out this line fixed the problem for me.