Probably another instance of the resolution probe hanging the box. Booting with xserver-xorg/autodetect_monitor=false should confirm this.
** Changed in: base-installer (Ubuntu) Sourcepackagename: base-installer => xresprobe -- Screen turns black - Installation on IBM M52 https://launchpad.net/bugs/72040 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs