No Way Know How

 Read around the various different methods, but the best option seems to be using debtap to convert, then pacman to install. This is for the Aseprite sprite editor, for future reference. Steps: - download snapshot of debtap from the AUR - install it in the usual way - update it: debtap -u - run  debtap Aseprite-[whatever the filename is].deb - install the resulting .zst package with (sudo) pacman -U aseprite[whatever].pkg.tar.zst ...and it works straight off the bat. Pleasing.

TL;DR xmodmap -e 'keycode 135=' Might need to add it to .xinitrc or .bashrc for permanence Backstory Wanted to also disable caps lock and context menu in Arch. Capslock can be disabled with setxkbmap -option ctrl:nocaps which maybe should be in .xinitrc but I just put it in .bashrc because I don't care any more. [Update: found I could disable it in keyboard settings! Doh. no option for context menu however] Trying to do the same with context menu key was harder, since I couldn't identify a setxkbmap  option for it (see this gist and localectl list-x11-keymap-options for why). So then I'm looking for a utility that'll give me the key when I hit it in the terminal, so I end up installing xorg-xev  and its output is not readily comprehensible but it seems that this is the data: KeyPress event, serial 38, synthetic NO, window 0x4800001,     root 0x55c, subw 0x0, time 1940314, (592,577), root:(657,1719),     state 0x0, keycode 135 (keysym 0xff67, Menu), same_...

- join displays - set both to 16:9 - make built in display primary - put external display on top (current setup) Sometimes the setup is correct but it *looks* wrong because on-screen stuff like conky gets smeared out over the displays.  Pkill conky and restart it in a background thread with terminal: conky && exit

I spent an hour trying to figure out how to do this via the registery, but in the end I installed sharpkeys https://github.com/randyrants/sharpkeys/releases