[Bug 1019347] Re: A message: "mount: / is busy" appears every time shutting down or rebooting.

[mtdew3q]

Hi-

I was at a friends and his dell computer wouldn't shut down right. It is
Ubuntu 12.04. It hung on shutdown.  "Available to all users" did nothing
to solve this for my friend. I tried maybe the uncovential method of
renaming /etc/init/plymouth.conf to ... plymouth.conf.disabled. After
that, I had to go to rescue system to put it back by renaming it back to
original. I had to mount root in rescue system as read/write to rename
again. Plymouth on crunchbang didn't work for me on usb live persistent,
but that is another story. My thought was, as per other peoples reports,
to disable plymoth to eliminate that plymouth was causing this problem.

My friend has a pc that he can't shut down, unless he holds down the
power button. I don't know what to tell him at this point. Using the
command line to shut down doesn't work either.

It seems weird that I run unbuntu 12.04 and my pc works fine and his
doesn't. I think it is a hardware related issue with a driver or
firmware or something different. I can brag and say that I have a
ZaReason, but my friend is not so lucky.

I am going to tell him to either buy dell for linux, system76 or
zareason if he wants a new one.

I can't fix it :-( I gave up after having to go to rescue mode and undo
disabiling plymouth.

thanks,
mtdew3q

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https://bugs.launchpad.net/bugs/1019347

Title:
  A message: "mount: / is busy" appears every time shutting down or
  rebooting.

Status in “plymouth” package in Ubuntu:
  Confirmed
Status in “upstart” package in Ubuntu:
  Invalid

Bug description:
  I arrived here from bug 963106
  [https://bugs.launchpad.net/bugs/963106]. I thought that it was a
  problem with network-manager, but it was not.

  I was suggested that it is probably a problem with upstart : "that
  modemmanager simply hasn't had time to complete the shutdown process
  before umountroot is run. Since modemmanager is an upstart job,
  sendsigs doesn't kill it."

  lsb_release -rd:
       Description:	Ubuntu 12.04 LTS
       Release:	        12.04

  apt-cache policy upstart:
     upstart:
    Installed: 1.5-0ubuntu7
    Candidate: 1.5-0ubuntu7
    Version table:
   *** 1.5-0ubuntu7 0
          500 http://kambing.ui.ac.id/ubuntu/ precise-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1.5-0ubuntu5 0
          500 http://kambing.ui.ac.id/ubuntu/ precise/main amd64 Packages

  Hope this will be fixed. Thanks.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: upstart 1.5-0ubuntu7
  ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
  Uname: Linux 3.2.0-26-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
  Date: Sat Jun 30 00:08:18 2012
  InstallationMedia: Custom Live CD - Release amd64
  SourcePackage: upstart
  UpgradeStatus: No upgrade log present (probably fresh install)

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