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After upgrading to Ubuntu 14.04 I am unable to login via POP/IMAP/Roundcube. Then I restored the following files
10-auth.conf.ucf-dist to 10-auth.conf 10-mail.conf.ucf-dist to 10-mail.conf 20-pop3.conf.ucf-dist to 20-pop3.conf
Now I can login. but mailbox is empty.
Solved.
/etc/dovecot/conf.d/10-mail.conf:
mail_location = maildir:~/Maildir