Unwisely, perhaps, I attempted an upgrade from within a running desktop. I replaced my sources.list entries for TDE with: # Trinity desktop deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-v3.5.13/debian squeeze main deb-src http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-v3.5.13/debian squeeze main deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-builddeps-v3.5.1… squeeze main deb-src http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-builddeps-v3.5.1… squeeze main aptitude update succeeded on the second attempt and then I ran aptitude upgrade. The first sign of trouble was that the window manager crashed as the update was applied. I was left with only the running windows and no borders. The only way to switch windows was to click in a different window, so I shut them all down with CTRL-Q and then I selected "end current session from a right-click menu. This dropped me straight back to a command line. All attempts to restart X and KDM failed, so I rebooted to see if that made any difference. I was still stuck at the command line, so I reverted my sources.list and tried to revert kdm. That failed with dependency issues, so I wiped all of trinity 3.5.13 and reinstalled 3.5.12, which restored my desktop to normal functioning. Neil Youngman