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Ever since some update in the Quantal pre-releases, having dnsmasq-base
installed will cause the root filesystem to not be properly unmounted on
shutdown and reboot. In case the Plymouth splash screen is disabled, the
message 'mount: / is busy' will be shown, but otherwise the user will
not even be aware of this problem.
After rebooting, the root filesystem needs recovery, as shown in dmesg:
kevin@vbox-xubuntu-quantal:~$ dmesg | grep EXT4
[ 1.022746] EXT4-fs (sda2): INFO: recovery required on readonly filesystem
[ 1.022750] EXT4-fs (sda2): write access will be enabled during recovery
[ 1.248294] EXT4-fs (sda2): recovery complete
[ 1.248661] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts:
(null)
[ 1.456315] EXT4-fs (sda2): re-mounted. Opts: errors=remount-ro
Yet again, the user will not be aware of this until it is too late. The
only way to avoid this from happening (or at least what I've found) is
running 'sudo apt-get purge dnsmasq-base'. Sadly, this also removes
network-manager and network-manager-gnome, so it isn't really a viable
solution.
Another problem that might be related is that having an active
connection with the Network Manager prior to shutting down or rebooting,
will cause the process to hang for a few seconds, after which the
message about / being busy is shown. Stopping the network service (sudo
service networking stop) will solve the hanging, but not the unclean
unmount. So far, only purging dnsmasq-base seems to do that, which
obviously also solves the other problem, as Network Manager will then
also be removed.
Although I haven't experienced it yet, this could cause potential data
loss; especially for users without a seperate /home partition.
ProblemType: Bug
ApportVersion: 2.5.3-0ubuntu1
Architecture: amd64
Date: Sun Sep 30 12:49:24 2012
DistroRelease: Ubuntu 12.10
Package: dnsmasq-base 2.63-1ubuntu1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 3.5.0-16.25-generic 3.5.4
SourcePackage: dnsmasq
Tags: quantal
Uname: Linux 3.5.0-16-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: network-manager (Ubuntu)
Importance: High
Status: In Progress
** Tags: busy dnsmasq-base is mount network-manager quantal root unclean unmount
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In Quantal, the root filesystem is not cleanly unmounted at shutdown or reboot
https://bugs.launchpad.net/bugs/1058987
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