Comment 2 for bug 995514

Your errors translate as:

trousers (0.3.7-2ubuntu1) will be established ...
The system user  "TSSA" already exists. End of program.
  * Starting Trusted Computing daemon TCSD [118G
  [112G [[31mfail [39; 49m]
invoke-rc.d: initscript trousers, action "start" failed.
dpkg: error processing trousers (- configure):
  Subprocess post-installation script returned error New

but trousers installs and removes cleanly for me; (just says 'device driver not loaded, skipping,) although I don't have a TPM