I have managed to get around this problem. It appears to be due to the
presence/non-presence of some directories and files.
I made sure the following were present:
/var/run/dovecot/login
/var/run/dovecot/login
/etc/dovecot/dovecot.conf
I was then able to reinstall dovecot-common
There is a bug 255367 which has this information in it.
There was also another problem when tring to start dovecot.
Warning: mail_extra_groups setting was often used insecurely so it is now
deprecated,
use mail_access_groups or mail_privileged_group instead
This can be fixed by editing /etc/dovecot.conf
change the line:
mail_extra_groups = mail
to:
mail_access_groups = mail
I found this information at
http://www.rasyid.net/2008/03/11/upgrade-dovecot-1010-to-1013/
** Changed in: dovecot (Ubuntu)
Status: Incomplete => Confirmed
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package dovecot-common 1:1.0.10-1ubuntu5.1 failed to install/upgrade:
subprocess post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/239752
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