Fetching error when installing Heroku

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http://askubuntu.com – I tried to install Heroku in Ubuntu using this script wget -qO- https://toolbelt.heroku.com/install-ubuntu.sh | sh and I get this error while installing heroku-toolbelt package Failed to fetch http://toolbelt.heroku.com/ubuntu/./foreman-0.60.0.deb Size mismatch E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? I tried to download "http://toolbelt.heroku.com/ubuntu/./foreman-0.60.0.deb" manually to /var/cache/apt/archives/ but didn't work with the same error. Any ideas to get this thing installed ? (HowTos)