Keyboard in Trinity and K*-trinity applications in LXDE

I am running: Trinity 3.5.13 updated with Slavek's patches Squeeze LXDE installed and used when essential I have just run aptitude update. There were no upgrades. There were 2 yesterday. My keyboard has disappeared in Trinity. There is obviously nothing wrong with the keyboard(s), both PS2 and USB, both of which I have tried, or the connection to the motherboard, since keyboards work in the BIOS, gdm and LXDE. This situation is made worse for me by the fact that k*-trinity applications, with the exception of Konqueror, will not run in LXDE. There is no KWrite, and I do not find Nano a long term acceptable substitute, and I can run neither KMail nor Amarok. Not only are these applications not in the menu, they will not run in the console, with error message "command not found". What have I done to upset Trinity?? And how do I persuade it to function for me again?? There is obviously a problem with my imported home. Other people for whom I have installed Trinity, but who had little or no previous data, have ridden off into the sunset. But what problem, where? Lisi