to make linux system supports the encryption of passwords with the MD5 algorithm, u need to install Perl MD5 on your linux system.
this is how to install it on your system

# wget http://www.cpan.org/modules/by-module/MD5/MD5-1.7.tar.gz
# gunzip MD5-1.7.tar.gz
# tar xvf MD5-1.7.tar
# cd MD5-1.7
# perl Makefile.PL
# make
# make install

DONE !!

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