There are other bugs in Ubuntu that can cause shutdown problems, for example Bug #665195 and bug #665176.
I fixed my problems by creating a /etc/init.d/sysshutdown as attached (and adding it to the various runlevels). This at least gives you a chance to examine the situation (in Virtual Console 9) and do a Alt + Sysrq + RSEIUB if need be. This, or something similar, should be included in distributions, since improper shutdown is dangerous. Sysrq can be simulated by writing to /proc/sysrq-trigger. Ubuntu should at least force-remount read-only (via sysrq) before doing its customary improper shutdowns. ** Attachment added: "sysshutdown script" https://bugs.launchpad.net/ubuntu/+source/sysvinit/+bug/665185/+attachment/2130969/+files/sysshutdown -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/665185 Title: /etc/init.d/sendsigs fails to kill some processes -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs