I've been able to complete all the steps from
$ sudo add-apt-repository ppa:pipelight/stable
$ sudo apt-get update
$ sudo apt-get install pipelight-multi
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package pipelight-multi is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'pipelight-multi' has no installation candidate
apt-cache search pipelight
list? – mchid Dec 27 '14 at 07:53dpkg -l | grep pipelight
will show what is installed (if anything) – mchid Dec 27 '14 at 07:59ls /etc/apt/sources.list.d/ | grep pipelight
? – mchid Dec 27 '14 at 08:19sudo apt-get update
again before trying again and if it still fails, you can always download the deb packages from here https://launchpad.net/~pipelight/+archive/ubuntu/stable/+sourcepub/4611331/+listing-archive-extra and install the deb file by right clicking and choosing to open it with software center, synaptic, or gdebi. i386.deb for 32bit and amd64.deb for 64 of course. – mchid Dec 27 '14 at 08:56