I am installing ubuntu downloaded recently into my pc with GT 240 graphics card. the installation is hanging . when pressing alt+sshift +f1 I saw many errors starting with nouveau. Killing the installation and trying to restart with nomodeset option from F6 menu . Still facing the same errors. I tried also to use skill command to kill nouveau but failed.
You can not kill or skip nouveau because it is part an integral part of linux kernel, part a module of X server. It goes in separate package but removing it is a really bad idea. You can blacklist nouveau module but this will likely lead to your GUI not booting at all.
You should ask a new question with proper details on the problem, the community will solve it.