从Ubuntu 11.04升级到11.10时，我要求将我的电子邮件帐户转换为新格式（maildir）。
现在我无法看到消息：在启动时，一切似乎都很好，但是当我点击消息时，会出现一个巨大的黄色条，表示进化无法打开数据库文件。
终端显示了很多错误：
** (evolution:4113): CRITICAL **: categories_icon_theme_hack: assertion `filename != NULL && *filename != '\0'' failed
(evolution:4113): camel-CRITICAL **: camel_session_add_service: assertion `uri_string != NULL' failed
(evolution:4113): camel-WARNING **: Could not save object state file to '/home/mathieu/.local/share/evolution/mail/local/.#..cmeta': Erreur d'entrée/sortie
(evolution:4113): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
The overwriting error message was: unable to open database file
(evolution:4113): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
The overwriting error message was: unable to open database file
(evolution:4113): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
The overwriting error message was: no such table: main.folders.db-journal_preview
(evolution:4113): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
The overwriting error message was: no such table: main.folders.db-journal
(evolution:4113): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
The overwriting error message was: no such table: main.folders.db-journal
(evolution:4113): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
The overwriting error message was: no such table: main.folders.db-journal
(evolution:4113): camel-WARNING **: Could not open converter for 'unicode-1-1-utf-7' to 'UTF-8' charset
我试图运行描述here的技巧：所有数据库似乎都没问题，但问题仍然存在。
偶尔进化会取出我的邮件，但我看不懂。