新手求助! [安装postfix]

[testing]

各位大哥! 小弟接触ubuntu不久, 为了学习想自己安装一台电邮服务器, 新装的时候一点事都没有, 邮件可以正常收发, 昨晚想再深一步安装 postfix+mailscanner+spamassassin, 但不成功, /var/log/mail.err出现以下错误信息, 电邮也无法正常收取,请问怎么解决啊? 昨晚一直在网上找解决方法, 找了个通宵都未能找到解决方法, 所以来这里求助啦! 望各位能帮帮忙, 多谢!

Apr 11 17:49:01 myub postfix/qmgr[6926]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:50:02 myub postfix/qmgr[6927]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:51:03 myub postfix/qmgr[6928]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:52:04 myub postfix/qmgr[6929]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:53:05 myub postfix/qmgr[6930]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:54:06 myub postfix/qmgr[6931]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:55:07 myub postfix/qmgr[6932]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:56:08 myub postfix/qmgr[6933]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:57:09 myub postfix/qmgr[6934]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:58:10 myub postfix/qmgr[6935]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 17:59:11 myub postfix/qmgr[6936]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:00:12 myub postfix/qmgr[6940]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:01:13 myub postfix/qmgr[6942]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:02:14 myub postfix/qmgr[6943]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:03:15 myub postfix/qmgr[6945]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:04:16 myub postfix/qmgr[6946]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:05:17 myub postfix/qmgr[6947]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:06:18 myub postfix/qmgr[6948]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:07:19 myub postfix/qmgr[6949]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:08:20 myub postfix/qmgr[6953]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:09:21 myub postfix/qmgr[6961]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:10:22 myub postfix/qmgr[6962]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:11:23 myub postfix/qmgr[6964]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:12:24 myub postfix/qmgr[6965]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:13:25 myub postfix/qmgr[7045]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:14:26 myub postfix/qmgr[7047]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:15:27 myub postfix/qmgr[7048]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:16:28 myub postfix/qmgr[7049]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:17:29 myub postfix/qmgr[7057]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:18:30 myub postfix/qmgr[7058]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:19:31 myub postfix/qmgr[7059]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted
Apr 11 18:20:32 myub postfix/qmgr[7062]: fatal: qmgr_move: update active/668E93AAA5D time stamps: Operation not permitted