[Dovecot] Dovecot Update on Ubuntu from 1.0.10 to 1.2 doesn't work

[franc walter]

Hello,

i have an ubuntu 8.04 LTS Virtual Server with Dovecot 1.0.10 and postfix.
Now i tried to update Dovecot because i need Quota, which is not possible in
1.0 but in 1.2
So i added the packages to my /etc/apt/sources.list:

deb http://codex.xiaoka.com/apt hardy main restricted
deb http://archive.ubuntu.com/ubuntu hardy-backports main universe
multiverse restricted

and updated dovecot with aptitude. After this i killed the proc master and
restarted postfix and dovecot but now dovecot is running but doesn't get any
more mails from postfix.
I had to downgrade back to 1.0.10 and after this all is working again.

I immediately looked into the mail.log, but i didn't see any clear errors.
I uploaded the mail.log here, maybe someone could give me a hint, what it
could be:

http://7fw.de/tmp/2011-01-24-23-38-mail.log

I started the update at 2011-01-23 at 23:00 and downgraded back at
2011-01-24 at 00:26.
In the error.log i only have errors about inotify, which is not available on
the ubuntu server (old kernel version, cannot be updated by provider).

I set in dovecot.conf:

mail_debug=yes
auth_debug=yes
auth_debug_passwords=yes

but this didn't help me.

Thank you,
Kind regards, franc walter