What are the differences between https://launchpad.net/~chris-lea/+archive/ubuntu/redis-server and https://launchpad.net/~rwky/+archive/ubuntu/redis?
I know this is old, but considering it never received an answer:
https://launchpad.net/~chris-lea/+archive/ubuntu/redis-server is a (somewhat) currently maintained launchpad build of redis while https://launchpad.net/~rwky/+archive/ubuntu/redis seems to be non-existent these days meaning it was probably someones fork to either fix their own bugs, or possible to do work and submit the changes back upstream.
~chris-lea seems to maintain many PPAs for different web related packages, without actually being associated with the packages development, which points to someone who probably for work or the like needs to make sure there is simple access to build-able code, hence the first P of PPA (Personal).
TL;DR - Use the first one - it works.
There is now an official PPA at:
This was made in colloboration with Chris Lea, so it seems antirez trusts him. So if the official ppa has no build, use chrislea. See the thread here: https://github.com/redis/redis/issues/1732