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 yatm (NewVersion1)
E: Problem with MergeList /var/lib/apt/lists/mirror.positive-internet.com_debian_dists_squeeze_main_binary-i386_Packages
W: Unable to munmap
E: The package lists or status file could not be parsed or opened.
These errors occur when adding new apt source list.
Add the following line to either /etc/apt/apt.conf or /etc/apt/apt.conf.d/70debconf