I should have left my Ubuntu 12.04 LTS well alone. Yes, it is over 2 years old, but it worked rock solid and I’ve been good about installing updates on it.

I don’t know what devil rode me last Friday, but when the system informed me that an upgrade to 14.04.1 LTS was available, I went ahead and gave it a try. I should have known better.

When the upgrade finished many hours later, POP access to the dovecot server was no longer working and rsync using modules was broken (rsync daemon not running). I had accepted all the defaults to keep existing configuration files during the upgrade. It turned out that dovecot needed some changes for namespace inbox:

namespace inbox {
...
inbox=yes
}

The rsync daemon needed to be manually enabled again via

sudo vi /etc/default/rsync

RSYNC_ENABLE=true

Hopefully I won’t stumble across more problems that will need fixing, but the experience was a reminder not to needlessly mess with a working system.