Have tested this; purging bootchart does rebuild the initramfs; are you sure you didn't boot into an older kernel version?
** Changed in: bootchart (Ubuntu) Status: Confirmed => Rejected -- Purging bootchart leaves stuff behind https://launchpad.net/bugs/89258 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs