apt-get install unzip get strange error
i am trying to install unzip and get this error:
root@bo:~# apt-get install unzip
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following packages will be upgraded:
1 upgraded, 0 newly installed, 0 to remove and 54 not upgraded.
1 not fully installed or removed.
Need to get 0 B/193 kB of archives.
After this operation, 386 kB of additional disk space will be used.
(Reading database …
dpkg: warning: files list file for package `unzip’ missing, assuming package has no files currently installed.
(Reading database … 219960 files and directories currently installed.)
Preparing to replace unzip 6.0-4ubuntu2.5 (using …/unzip6.0-4ubuntu2.5amd64.deb) …
Unpacking replacement unzip …
dpkg: unrecoverable fatal error, aborting:
fork failed: Cannot allocate memory
E: Sub-process /usr/bin/dpkg returned an error code (2)
Please suggest to fix that issue.