I have the same problem with xemacs, and I believe this is an xorg issue. I reported it as ubuntu-but emacs as it was that was the command I Initially typed that demonstrated the issue.
karim@ulappy01:~$ sudo apt-cache policy xemacs21 xemacs21: Installed: 21.4.22-3.1ubuntu1 Candidate: 21.4.22-3.1ubuntu1 Version table: *** 21.4.22-3.1ubuntu1 0 500 http://ca.archive.ubuntu.com/ubuntu/ oneiric/universe amd64 Packages 100 /var/lib/dpkg/status -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/917394 Title: xserver restarts when I start emacs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/emacs23/+bug/917394/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs