I try to install Readahead-Fedora withe the command line : sudo apt-get install readahead-fedora But doesn't work! How can I install readahead-fedora? 
How to install Readahead-Fedora on Lubuntu 15.10?
fedora;apt;lubuntu
The last Ubuntu version having readahead-fedora was 15.04, according to ubuntu.packages.Ubuntu 15.10 came up with systemd which changed the boot process so readahead-fedora is no longer applicable.