[kakakiki]

I see that tmux doesn't come as part of standard ubuntu installation. So I think that puts it at a disadvantage for not being omnipresent.

[laumars]

Neither is about 99% of the other software that Ubuntu desktops and servers run daily. Hence why we have software repositories and user friendly package managers to make installing new software a breeze:

    apt-get install tmux

[XorNot]

byobu is a sink-included tmux distribution in Ubuntu, that does most of the hard setup work for you.

I still like tmux for getting several servers in debug mode on the same screen when using docker though.