apt-get update sorunu ?

[Mehmet Fatih AKBULUT <mfatihakbulut@gmail.com>]

merhaba,
apt-get update dedigimde asagidaki sorunla karsilasiyorum :
.
.
Reading package lists... Error!
E: Couldn't make mmap of 134217728 bytes - mmap (12 Cannot allocate memory)
W: Unable to munmap
E: The package lists or status file could not be parsed or opened.
Reading package lists... Error!
E: Couldn't make mmap of 134217728 bytes - mmap (12 Cannot allocate memory)
W: Unable to munmap
E: The package lists or status file could not be parsed or opened.
Reading package lists... Error!
E: Couldn't make mmap of 134217728 bytes - mmap (12 Cannot allocate memory)
W: Unable to munmap
E: The package lists or status file could not be parsed or opened.

ne yapmaliyim ?