我有一部 Ubuntu 手机，它使用syncevolution 作为联系人的后端。我使用命令行在手机上保存 CardDav 联系人。但自从我从自签名证书切换到 LetsEncrypt（相关或不相关）后，我遇到了大量错误。
$ syncevolution owncloud contacts
[WARNING] owncloud: ignoring username , it is not needed
[INFO] @default/9frfrenchholiday: inactive
[INFO] @default/9rd2q8ps5e2r48skvidunfkoms8: inactive
[INFO] @default/addressbook: inactive
[INFO] @default/calendar: inactive
[INFO] @default/memo: inactive
[INFO] @default/todo: inactive
[WARNING] owncloud: ignoring username , it is not needed
[INFO @owncloud] target side of local sync ready
[INFO @owncloud] @owncloud/addressbook: inactive
[INFO @owncloud] @owncloud/calendar: inactive
[INFO @owncloud] @owncloud/memo: inactive
[INFO @owncloud] @owncloud/todo: inactive
[INFO @owncloud] @owncloud/contacts: using configured database=[censored!]
[INFO @owncloud] @owncloud/contacts: starting slow sync, two-way (peer is server)
[INFO @owncloud] @owncloud/contacts: slow sync done unsuccessfully
[ERROR @owncloud] @owncloud/contacts: local, status 20048
[ERROR @owncloud] error code from Synthesis engine local, status 20048
Synchronization failed, see /home/phablet/.cache/syncevolution/target_+config@owncloud-2017-04-19-10-34-a/syncevolution-log.html for details.
Changes applied during synchronization (@owncloud):
+---------------|-----------------------|-----------------------|-CON-+
| | @owncloud | @default | FLI |
| Source | NEW | MOD | DEL | ERR | NEW | MOD | DEL | ERR | CTS |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| contacts | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| slow, 0 KB sent by client, 0 KB received |
| unexpected slow sync (local, status 22000) |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| start Wed Apr 19 10:34:14 2017, duration 0:01min |
| unexpected slow sync (local, status 22000) |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
First ERROR encountered: local, status 20048
Doing a slow synchronization may lead to duplicated items or
lost data when the server merges items incorrectly. Choosing
a different synchronization mode may be the better alternative.
Restart synchronization of affected source(s) with one of the
following sync modes to recover from this problem:
slow, refresh-from-server, refresh-from-client
Analyzing the current state:
syncevolution --status target-config@owncloud contacts
Running with one of the three modes:
syncevolution --sync [slow|refresh-from-remote|refresh-from-local] target-config@owncloud contacts
[ERROR] error code from SyncEvolution unexpected slow sync (local, status 22000): failure on target side @owncloud of local sync
[INFO] @default/contacts: inactive
[ERROR] @default/contacts: aborted on behalf of user (local, status 20017)
[INFO] creating complete data backup after sync (enabled with dumpData and needed for printChanges)
Synchronization failed, see /home/phablet/.cache/syncevolution/owncloud-2017-04-19-10-34/syncevolution-log.html for details.
Changes applied during synchronization:
+---------------|-----------------------|-----------------------|-CON-+
| | @default | @owncloud | FLI |
| Source | NEW | MOD | DEL | ERR | NEW | MOD | DEL | ERR | CTS |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| contacts | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| unexpected slow sync (local, status 22000) |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| start Wed Apr 19 10:34:13 2017, duration 0:02min |
| unexpected slow sync (local, status 22000) |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
First ERROR encountered: local, status 20048
Doing a slow synchronization may lead to duplicated items or
lost data when the server merges items incorrectly. Choosing
a different synchronization mode may be the better alternative.
因此，我决定尝试一些我不太记得的事情（例如强制与本地/远程刷新同步）并通过以下方式更改了上一个日志的结尾：
First ERROR encountered: local, status 20048
Doing a slow synchronization may lead to duplicated items or
lost data when the server merges items incorrectly. Choosing
a different synchronization mode may be the better alternative.
Restart synchronization of affected source(s) with one of the
following sync modes to recover from this problem:
slow, refresh-from-server, refresh-from-client
Analyzing the current state:
syncevolution --status owncloud contacts
Running with one of the three modes:
syncevolution --sync [slow|refresh-from-remote|refresh-from-local] owncloud contacts
然后：
Data modified @default during synchronization:
*** @default/calendar ***
Comparison was impossible.
从这一步开始，我无法再从手机中删除联系人并使其在服务器上同步（以删除服务器本身上的联系人），而是仅“清除”联系人（任何信息都会消失，但联系人会被删除）仍然在这里并保留名字和姓氏）。我可以将服务器上创建的联系人同步到手机上，也可以将手机上创建的联系人发送到服务器上。
备份数据库似乎已损坏，但我无法完全重置我的配置。我只是想从零开始，但我找不到任何方法来做到这一点。 :'(
phablet@ubuntu-phablet:~$ syncevolution --print-sessions owncloud
/home/phablet/.cache/syncevolution/owncloud-2017-04-20-11-04-b
+---------------|-----------------------|-----------------------|-CON-+
| | LOCAL | REMOTE | FLI |
| Source | NEW | MOD | DEL | ERR | NEW | MOD | DEL | ERR | CTS |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| contacts | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
| two-way, 0 KB sent by client, 0 KB received |
| item(s) in database backup: 2 before sync, 2 after it |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| start Thu Apr 20 11:04:51 2017, duration 0:05min |
| synchronization completed successfully |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
/home/phablet/.cache/syncevolution/owncloud-2017-04-20-11-05
+---------------|-----------------------|-----------------------|-CON-+
| | LOCAL | REMOTE | FLI |
| Source | NEW | MOD | DEL | ERR | NEW | MOD | DEL | ERR | CTS |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| contacts | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 |
| two-way, 0 KB sent by client, 0 KB received |
| item(s) in database backup: 2 before sync, 2 after it |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| start Thu Apr 20 11:05:24 2017, duration 0:05min |
| synchronization completed successfully |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
+
phablet@ubuntu-phablet:~$ syncevolution --restore /home/phablet/.cache/syncevolution/owncloud-2017-04-20-11-05 --before owncloud contacts
[INFO] 9frfrenchholiday: inactive
[INFO] 9rd2q8ps5e2r48skvidunfkoms8: inactive
[INFO] addressbook: inactive
[INFO] calendar: inactive
[INFO] memo: inactive
[INFO] todo: inactive
[INFO] contacts: restore from backup
Data changes to be applied locally during restore:
*** contacts ***
Comparison was impossible.
[INFO] contacts: started
[INFO] contacts: restore done successfully
[INFO] Item changes that were applied locally during restore:
[INFO] +---------------------------------------|-----------------------------+
[INFO] | | LOCAL |
[INFO] | Source | NEW | MOD | DEL | ERR |TOTAL|
[INFO] +---------------------------------------+-----+-----+-----+-----+-----+
[INFO] | contacts | 0 | 0 | 0 | 0 | 2 |
[INFO] +---------------------------------------+-----+-----+-----+-----+-----+
[INFO] The same incremental changes will be applied to the server during the next sync.
[INFO] Use -sync refresh-from-client to replace the complete data on the server.
+
phablet@ubuntu-phablet:~$ syncevolution --sync=refresh-from-client owncloud contacts
[WARNING] owncloud: ignoring username , it is not needed
[INFO] @default/9frfrenchholiday: inactive
[INFO] @default/9rd2q8ps5e2r48skvidunfkoms8: inactive
[INFO] @default/addressbook: inactive
[INFO] @default/calendar: inactive
[INFO] @default/memo: inactive
[INFO] @default/todo: inactive
[WARNING] owncloud: ignoring username , it is not needed
[INFO @owncloud] target side of local sync ready
[INFO @owncloud] @owncloud/addressbook: inactive
[INFO @owncloud] @owncloud/calendar: inactive
[INFO @owncloud] @owncloud/memo: inactive
[INFO @owncloud] @owncloud/todo: inactive
[INFO @owncloud] @owncloud/contacts: using configured database=[censored!]
[INFO @owncloud] @owncloud/contacts: starting first time sync from client (peer is server)
[INFO @owncloud] @owncloud/contacts: sent 2/2
[INFO] @default/contacts: starting slow sync from client (peer is client)
[INFO] creating complete data backup of datastore contacts before sync (enabled with dumpData and needed for printChanges)
@default data changes to be applied during synchronization:
*** @default/contacts ***
Comparison was impossible.
[INFO] @default/contacts: deleting "test estse"
[INFO] @default/contacts: deleting "Gvv"
[INFO] @default/contacts: deleting 2/2
[INFO] @default/contacts: started
[INFO] @default/contacts: adding "test estse"
[INFO] @default/contacts: adding "Gvv"
[INFO] @default/contacts: received 2
[INFO @owncloud] @owncloud/contacts: started
[INFO] @default/contacts: slow sync done successfully
[INFO @owncloud] @owncloud/contacts: first time sync done successfully
Synchronization successful.
Changes applied during synchronization (@owncloud):
+---------------|-----------------------|-----------------------|-CON-+
| | @owncloud | @default | FLI |
| Source | NEW | MOD | DEL | ERR | NEW | MOD | DEL | ERR | CTS |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| contacts | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
| refresh-from-local, 0 KB sent by client, 0 KB received |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| start Thu Apr 20 11:24:17 2017, duration 0:04min |
| synchronization completed successfully |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
[INFO] creating complete data backup after sync (enabled with dumpData and needed for printChanges)
Synchronization successful.
Changes applied during synchronization:
+---------------|-----------------------|-----------------------|-CON-+
| | @default | @owncloud | FLI |
| Source | NEW | MOD | DEL | ERR | NEW | MOD | DEL | ERR | CTS |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| contacts | 2 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
| refresh-from-remote, 0 KB sent by client, 0 KB received |
| item(s) in database backup: 2 before sync, 2 after it |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| start Thu Apr 20 11:24:17 2017, duration 0:04min |
| synchronization completed successfully |
+---------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+
Data modified @default during synchronization:
*** @default/contacts ***
Comparison was impossible.