# trim repos to stable only
sed -i -e '/security/d' /etc/apt/sources.list
sed -i -e '/experim/d' /etc/apt/sources.list
sed -i -e '/old-stable/d' /etc/apt/sources.list
sed -i -e '/testing/d' /etc/apt/sources.list
sed -i -e '/oldstable/d' /etc/apt/sources.list
sed -i -e '/unstable/d' /etc/apt/sources.list
#    4  sudo nano /etc/apt/sources.list
apt-get update
apt-get install -y libmath-gmp-perl perl-modules-5.32 libmath-bigint-gmp-perl
#    7  perl -Mbignum=lib,GMP -e 'print 9->bnok(2),"\n"'