Hi I am using server edition of Ubuntu for my server and i have two questions ... First i want to install whole machine through desktop environment so i want to install ubuntu-desktop but after i want to remove so how can i do so completely remove it after? And second i am trying to install ACE http://download.dre.vanderbilt.edu/previous_versions/ACE-5.7.5.zip from this and i need some advices. How to even configure? When i do basic procedures like mkdir build cd build ../configure is says bash: ../configure: /bin/sh^M: bad interpreter: No such file or directory But the file is there here is message when i try to execute non existing file: bash: ./configure: No such file or directory So i did aptitude install tofrodos dos2unix configure And now i have this message: configure: error: cannot run /bin/bash ../aux_config/config.sub