unable to install virtual box on ubuntu 12.04 LTS x64

unable to install virtual box on ubuntu 12.04 LTS x64

I downloaded x64 version of VirtualBox from its official site as I am
having Ubuntu 12.04 LTS x64 version. Its of 64 MB .deb file. Now when I
try to install it, it is causing error.
Package operation failed
The installation or removal of a software package failed.
(Reading database ...
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(Reading database ... 145794 files and directories currently installed.)
Unpacking virtualbox-4.2 (from
.../virtualbox-4.2_4.2.16-86992~Ubuntu~precise_amd64.deb) ...
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
xz: (stdin): Compressed data is corrupt
dpkg-deb (subprocess): subprocess data returned error exit status 1
dpkg-deb: error: subprocess <decompress> returned error exit status 2
dpkg-deb (subprocess): failed in write on buffer copy for failed to write
to pipe in copy: Broken pipe
dpkg: error processing
/home/anujsharma/Desktop/virtualbox-4.2_4.2.16-86992~Ubuntu~precise_amd64.deb
(--install): short read on buffer copy for backend dpkg-deb during
`./usr/share/doc/virtualbox-4.2/VirtualBox.chm' Processing triggers for
ureadahead ...
Every time this is happening dont know why.. Please help.