No help in LO

In the early 3.3.x line, there was a similar bug where I had to install en_GB language packs, and help packs, before I installed en_US ones to get the error - back then - to allow me to use the en_US help packs. There was a single letter in the wrong case [lower instead of upper I think] in one of the DEB files. That was fixed within the next version, if memory serves me.

SO is it EN US and EN Gb or EN GB?
One case difference will make a Linux user pull his/her hair out trying to find the problem. As a former mainframe programmer, and an early PC-based programmer, these things could slip through the cracks. Although Windows seems not to care about case and file names in most places, it can mess up programs as well.

To be honest, I still run 3.5.4. Had too many other things on my plate to do instead of upgrading my systems to 3.5.5 [2 Ubuntu and 2 Windows as my active and not stored systems]. Maybe it is just the heat that has stopped me. 90+ degrees after 9pm, and 80+ after 11pm, is not my idea of good sleeping weather.