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Thomas,
I'm submitting this backup as requested in the Mythbuntu forum. It's a backup of a freshly installed mythbuntu maverick box with updates and myth and mythbuntu autobuilds applied up to 12/5/10. I tried to restore this to the same installation from which I backed it up and received the exact error as described by the bug reporter.

** Attachment added: "bare backup"
   https://bugs.launchpad.net/mythbuntu/+bug/661976/+attachment/1757958/+files/bug661976.tar.gz

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https://bugs.launchpad.net/bugs/661976

Title:
  Restoring from 9.10 to 10.10 gives traceback

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  Invalid

Bug description:
  Hi,

I'm trying to restore my 9.10 setup in 10.10.  I created a restore file in 9.10 using the following structure:

root@mythtv:~# tar -ztvf /tmp/backup/mythbuntu-system-backup-20101016-2029.tar.gz 
-rw-rw---- mythtv/mythtv   329 2009-12-31 15:03 etc/mythtv/config.xml
-rw-rw---- mythtv/mythtv  1124 2009-12-31 15:03 etc/mythtv/mysql.txt
-rw-r--r-- root/root       422 2009-10-31 14:34 etc/lirc/lircd.conf
-rw-r--r-- root/root      1071 2009-10-31 14:34 etc/lirc/hardware.conf
-rw-r--r-- root/root         7 2009-10-31 14:28 etc/hostname
-rw-r--r-- root/root       252 2009-10-31 14:28 etc/hosts
-rw-r--r-- hertz/hertz     803 2010-10-16 20:37 tmp/mythbuntu-bare/mythconverg-1244-20101016203750.sql

The .sql file was from 9.10 but made with the /usr/share/mythtv/mythconverg_backup.pl script from 10.10.

When I try to restore the .tar.gz that I made with the Mythbuntu Control Center I get a traceback on restore:

--start--
Window Title = DBus Exception

org.freedesktop.DBus.Python.RuntimeError

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/service.py", line 702, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/lib/python2.6/dist-packages/MythbuntuControlCentre/backend.py", line 252, in scriptedchanges
    for item in plugin_dictionary:
RuntimeError: dictionary changed size during iteration
--end--