As you may know, apt-fast is a wrapper over the apt-get package manager, using axel as the default download manager. apt-fast is good for low network connections, because aria2 is simultaneously downloading packages with multiple connections per package (from different sources).
The latest version available is apt-fast 1.8.3, which has been released a while ago.
Up to date packages are available via some third party PPA, so installing the software on Ubuntu systems is piece of cake. Just add the PPA to your system, update the local repository index and install the apt-fast package:
$ sudo add-apt-repository ppa:saiarcot895/myppa
$ sudo apt-get update
$ sudo apt-get install apt-fast
Optional, to remove apt-fast, do:
$ sudo apt-get remove apt-fast
The installation instructions should work on Ubuntu 15.04 Vivid Vervet, Ubuntu 14.04 Trusty Tahr, Ubuntu 12.04 Precise Pangolin, Linux Mint 17.2 Rafaela, Linux Mint 17.1 Rebecca, Linux Mint 17 Qiana, Linux Mint 13 Maya, Pinguy OS 14.04, Elementary OS 0.3 Freya, Elementary OS 0.2 Luna, Deepin 2014, Peppermint 6, Peppermint 5, LXLE 14.04 and Linux Lite 2.
apt-fast has the same syntax as apt-get (only that fast is used instead of get), so, to install one or more packages, do:
$ sudo apt-fast install packageone packagetwo packagethree