Installation of Xubuntu 13.10 beta2, also observed with Xubuntu 13.10 beta1 and 
Ubuntu 13.10 beta1.
Installation on Asus Eeee PC 1000H.

After partitioning (default options) a popup with this text appears:

Error informing the kernel about modifications to partition /dev/sda1 --
Device or resource busy. This means Linux won't know about any changes
you made to /dev/sda1 until you reboot -- so you shouldn't mount it or
use it in any way before rebooting.

I tried to update the partition information manually without success:

# partprobe /dev/sda
Error: Error informing the kernel about modifications to partition /dev/sda1 -- 
Device or resource busy. This means Linux won't know about any changes you made 
to /dev/sda1 until you reboot -- so you shouldn't mount it or use it in any way 
before rebooting.
Error: Failed to add partition 1 (Device or resource busy)

I checked the status of /dev/sda:

# fuser -v /dev/sda
                     USER        PID ACCESS COMMAND
/dev/sda:    root         4051 F....      parted_server

So parted_server wrongly keeps /dev/sda open.

After pressing "Ignore" button in the popup the same message appears for 
/dev/sda2.
After pressing "Ignore" button again the following message appears:

The ext4 file system creation in partition #1 of SCSI1 (0,0,0) (sda)
failed.

Then the parted_server does not keep /dev/sda open any more and the
kernel partition table (/proc/partitions) is partially updated
(/dev/sda5). After running partprobe /dev/sda the kernel partition table
is updated completely (sda1, sda2, sda5).

After pressing OK in the last pop-up, the installer returns to the
"Installation type" window. After pressing "Install now" the
installation normally continues.

** Also affects: ubiquity
   Importance: Undecided
       Status: New

** No longer affects: ubiquity

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https://bugs.launchpad.net/bugs/525033

Title:
  During installation "Error informing the kernel about modifications to
  partition /dev/XXX -- Device or resource busy"

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