Install go-ethereum client on Ubuntu 14.04

install-ethereal.sh

#!/bin/sh

if ! lsb_release -sr | grep 14.04 > /dev/null; then
  echo "This script is made for Ubuntu 14.04, this probably won't work."
  echo -p "Do you want to try it anyway? (y/n) " -n 1 -r
  if [[ ! $REPLY =~ ^[Yy]$ ]]; then
      exit 1
  fi
fi


echo "\033[1mInstalling Go and QT5 from PPA\033[0m"
echo "This may prompt for your password."
if ! dpkg -s qtbase5-private-dev > /dev/null; then
  sudo add-apt-repository ppa:ubuntu-sdk-team/ppa
  sudo apt-get -qq update
fi
sudo apt-get install -yqq golang git mercurial ubuntu-sdk qtbase5-private-dev \
       qtdeclarative5-private-dev libqt5opengl5-dev libgmp3-dev libreadline6-dev


if [ -z "$GOPATH" ]; then
  echo "\n\033[1mExporting environment variables.\033[0m"
  cat >> $HOME/.profile << "EOF"

# Go environment:
PATH=$PATH:$HOME/go/bin:/usr/local/go/bin
export GOPATH=$HOME/go
EOF

  # Equivalent to `source` in `sh`
  . $HOME/.profile
fi


echo "Dependencies satisfied."
echo "\n\033[1mNow installing the ethereum client\033[0m"
mkdir -p $HOME/go
go get -u github.com/ethereum/go-ethereum/ethereal
go get -u github.com/ethereum/go-ethereum/ethereum

echo "\n\033[1mInstallation complete\033[0m"
cat << "EOF"
You can now start Ethereal by issuing:

  cd $GOPATH/src/github.com/ethereum/go-ethereum/ethereal && ethereal

If you rather run without a GUI you can start ethereum by issuing the 'ethereum'
command. More informations on:

  https://github.com/ethereum/go-ethereum/wiki

EOF

Modifications from https://gist.github.com/maran/8dc397ed79331f16e284/8cdf7cf83a5cdb58cd5ea4fa28c6389e862ef58e:

• Use sh instead of bash
• Install golang from the ubuntu official repository
• Export PATH and GOPATH in ~/.profile instead of ~/.bashrc
• Check if GOPATH exists before writing in .profile (so this script could also be used to update the client)
• Check if ppa is already present before adding it (again, in case of an update)
• Clean the output
• Improve confirmation (y/n) check
• style: wrap in 80 columns

One line go-ethereum installer for Ubuntu 14.04:

$ curl https://gist.githubusercontent.com/mquandalle/ab0d31735e57010ce206/raw/13c0a08ddecae75355b853f7a00e97ca1d230124/install | sh

I installed go-ethereum on ubuntu 14.04 but, when I run this command cd $GOPATH/src/github.com/ethereum/go-ethereum/ethereal && ethereal I get this "ethereal: command not found". Please advice.

I get the same error. Please advise