What is the best repository to use?

Question

linux

There is a system assembled from Ubuntu server in KDE'ah.
Standard sources.list

deb http://ru.archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty main restricted

deb http://ru.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty-updates main restricted

deb http://ru.archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty universe
deb http://ru.archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty-updates universe

deb http://ru.archive.ubuntu.com/ubuntu/ trusty multiverse
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty multiverse
deb http://ru.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty-updates multiverse

deb http://ru.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://ru.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu trusty-security main restricted
deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
deb http://security.ubuntu.com/ubuntu trusty-security universe
deb-src http://security.ubuntu.com/ubuntu trusty-security universe
deb http://security.ubuntu.com/ubuntu trusty-security multiverse
deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse

Does it make sense to add the Kubuntu repositories?

apt-add-repository ppa:kubuntu-ppa/backports
или
add-apt-repository ppa:kubuntu-ppa/ppa

I looked at something, what kind of mess is in Kubunt, so something is not burning with the desire to use it "as is". It's easier for me to rebuild myself.

Answer 1

Do you want to collect yourself? gentoo exit)

Answer 2

Both repositories make sense:
for packages that are considered relevant to your installation by the Kubuntu community
for adapting more recent Kubuntu packages to your installation
. I don't get it, though, choosing from repositories, if you're frustrated at all by the mess in the ranks of Ubuntu. I switched to Arch Linux for the same reasons and am satisfied. For those who need more stable and combed hair - there is Manjaro. To simplify the first installation - Attergos, NetRunner, Evo/Lution