for your convinience these instuction is available as:
gist
git repo
ubuntu prerequisites
# Multiprecision arithmetic library developers tools, zlib
sudo apt-get install libgmp-dev zlib1g-dev -y
sudo -K
ghc installation
# get distr
cd $HOME/Downloads
# 64 bit
wget https://www.haskell.org/ghc/dist/7.10.1/ghc-7.10.1-x86_64-unknown-linux-deb7.tar.bz2
tar xvfj ghc-7.10.1-x86_64-unknown-linux-deb7.tar.bz2
# 32 bit
# wget https://www.haskell.org/ghc/dist/7.10.1/ghc-7.10.1-i386-unknown-linux-deb7.tar.bz2
# tar xvfj ghc-7.10.1-i386-unknown-linux-deb7.tar.bz2
cd ghc-7.10.1
# install to
mkdir $HOME/Development/bin/ghc-7.10.1
# or choose another path
./configure --prefix=$HOME/Development/bin/ghc-7.10.1
make install
# symbol links
cd $HOME/Development/bin
rm -f ghc
ln -s `pwd`/ghc-7.10.1 ghc
# add $HOME/Development/bin/ghc to $PATH
# add this line to ~/.profile
export GHC_HOME=$HOME/Development/bin/ghc
export PATH=$GHC_HOME/bin:${PATH}
# to use updated path without log off
source ~/.profile
# remove temporary files
cd $HOME/Downloads
rm -rfv ghc-7.10.1*
# remove old
rm -rfv $HOME/.cabal
rm -rfv $HOME/.ghc
# clone dist
cd $HOME/Downloads
curl -O https://www.haskell.org/cabal/release/cabal-1.22.3.0/Cabal-1.22.3.0.tar.gz
# extract
tar xzvf Cabal-1.22.3.0.tar.gz
cd Cabal-1.22.3.0
# build
ghc --make Setup.hs
./Setup configure --user
./Setup build
./Setup install
# Remove temporary files
cd $HOME/Downloads
rm -rfv Cabal-1.22.3.0*
# get distributive
cd $HOME/Downloads
curl -O https://www.haskell.org/cabal/release/cabal-install-1.22.3.0/cabal-install-1.22.3.0.tar.gz
# extract archive
tar xzvf cabal-install-1.22.3.0.tar.gz
cd cabal-install-1.22.3.0
# install
./bootstrap.sh
# remove temporary files
cd $HOME/Downloads
rm -rfv cabal-install-1.22.3.0*
# add path to cabal to PATH environment
export CABAL_HOME=$HOME/.cabal
export PATH=$CABAL_HOME/bin:$PATH