At every boot to start Ubuntu, a partition gets re-mounted more than 1 times, sometimes causing very long boots. Example below:

> dmesg
...
[   21.472020] EXT4-fs (sda5): re-mounted. Opts: errors=remount-ro
...
[   42.021537] EXT4-fs (sda5): re-mounted. Opts: errors=remount-ro,commit=0
...

I suspect there is a problem of overlapping partitions here, regarding sda4 and sda5:

> sudo fdisk -l
Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63      610469      305203+  de  Dell Utility
/dev/sda2          612352    32069631    15728640    7  HPFS/NTFS/exFAT
/dev/sda3   *    32069632   238979788   103455078+   7  HPFS/NTFS/exFAT
/dev/sda4       238983166   625141759   193079297    5  Extended
/dev/sda5       238983168   612630527   186823680   83  Linux
/dev/sda6       612632576   625141759     6254592   82  Linux swap / Solaris

Further details:

> more /etc/fstab
...
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
# / was on /dev/sda6 during installation
UUID=b33be99b-5c9e-449e-ad48-be608aeff001 /               ext4    errors=remount-ro 0       1
# swap was on /dev/sda7 during installation
UUID=7c9071cc-b77b-40da-9f80-6b8a9a220cb1 none            swap    sw    

and

> mount
/dev/sda5 on / type ext4 (rw,errors=remount-ro,commit=0)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/piero/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=piero)

I am Running Ubuntu Oneiric + LXDE on
Dell Studio XPS machine 64-bit, dual booting with Windows 7.

A months ago, I resized the Ubuntu partition and maybe I messed up something by doing that.

Do you have any idea, why this long booting is happening?