更新软件源出现错误

[JackyChao]

Fetched 13.7MB in 1min 57s (117kB/s)
Reading package lists... Error!
E: Dynamic MMap ran out of room. Please increase the size of APT::Cache-Limit. Current value: 25165824. (man 5 apt.conf)
E: Error occurred while processing libapache2-mod-php5 (NewVersion1)
E: Problem with MergeList /var/lib/apt/lists/ubuntu.uestc.edu.cn_ubuntu_dists_maverick-security_main_binary-amd64_Packages
W: Unable to munmap
E: The package lists or status file could not be parsed or opened.
寻求高手讲解一下。如何解决

[zzn]

你在用的源是ubuntu.uestc.edu.cn？
换个源试试