DeusXMachina's questions

Both my local and remote are Ubuntu 18, though I have seen it in 16 as well.

I establish a ssh to my remote server, start tmux (2.1.3), something causes the pipe to break. When I ssh back in, but before I start tmux, whenever I click in the terminal screen, it writes a bunch of junk to the buffer, like

0;38;15M 0;38;15m 0;60;12M0;60;12m0;56;14M0;56;14m0;56;14M0;56;14m0;54;13M0;54;13m0;54;13M0;54;13m

I've deduced that these numbers are of the form N;X;YM, where N is 0, 1, 2... for left click, middle, right click, X and Y are proportional to the location of the mouse click, M is mouse down, m is mouse up.

Clearly, this is some kind of in-band signalling, and I am pretty sure it relates to option mouse on. But where is it coming from? Is it just a Tmux thing, an ssh thing, or a Gnome terminal thing?

I see two packages in apt:

netplan.io - YAML network configuration abstraction for various backends

netplan - network server for `plan'

I presume netplan.io is the one for dealing with /etc/netplan/foo.yaml network configuration. Do I need to concern myself with netplan at all, or is this just a bad package name?