I've just done the upgrade on one VPS. I came across two issues.

The first was that, although it doesn't seem to be in the Debian release notes's list of obsolete packages, the list of packages that will be removed because it's been dropped includes sysklogd.

So if you use that for syslogd - and as I don't remember installing it, it was probably in the initial Lenny VPS - you need to install inetutils-syslogd instead. Before the upgrade is probably best but either way..

apt-get install inetutils-syslogd

.. will get a working syslogd.

Keith Williams said:

The whole Dovecot config set up has changed. But if, like me, you last
set it up a couple or more years ago, you need to follow the HOWTOs on
the web. It's very straight forward and you can infact forget the
include files and just set up one straight forward conf file from scratch

The relevant info is not quite as easy to find as it should be, but it seems to come down to going to /etc/dovecot and..

.. moving the ssl certificates:

/etc/dovecot# mv /etc/ssl/certs/dovecot.pam .
/etc/dovecot# mv /etc/ssl/private/dovecot.pam private/

(per the warning when apt-get fails to upgrade dovecot:

Setting up dovecot-core (1:2.1.7-7) ...
You already have ssl certs for dovecot.
However you should move them out of /etc/ssl
and into /etc/dovecot and update the configuration
in /etc/dovecot/conf.d/10-ssl.conf accordingly.
See /usr/share/doc/dovecot-core/README.Debian.gz for details.)

.. then upgrading the conf files:

/etc/dovecot# mv dovecot.conf dovecot.conf.squeeze
/etc/dovecot# doveconf -n -c dovecot.conf.ucf-old >dovecot.conf

That generates a series of warnings:

doveconf: Warning: NOTE: You can get a new clean config file with: doveconf -n > dovecot-new.conf
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:24: 'imaps' protocol is no longer necessary, remove it
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:24: 'pop3s' protocol is no longer necessary, remove it
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:101: ssl_cert_file has been replaced by ssl_cert = <file
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:103: ssl_key_file has been replaced by ssl_key = <file
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:665: protocol managesieve {} has been replaced by protocol sieve { }
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:814: add auth_ prefix to all settings inside auth {} and remove the auth {} section completely
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:851: passdb pam {} has been replaced by passdb { driver=pam }
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:888: userdb passwd {} has been replaced by userdb { driver=passwd }
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:960: userdb passwd {} has been replaced by userdb { driver=passwd }
doveconf: Warning: Obsolete setting in dovecot.conf.ucf-old:1023: auth_user has been replaced by service auth { user }

.. but the result is working.

(The source for the last bit reckoned you also needed

 chmod 644 dovecot.conf

too, but that's what it was.)

If I've missed anything, do let me know.

  Ian

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