According to Tormod comment, I change xscreensaver package to xserver- xorg-video-intel which has been confirmed to have problems by two persons. Thanks to Tormod for these clear informations.
** Changed in: xserver-xorg-video-intel (Ubuntu) Sourcepackagename: xscreensaver => xserver-xorg-video-intel -- braid screensaver crashes system with compiz activated https://bugs.launchpad.net/bugs/101943 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs