I first attempted some app development on my Ubuntu tower and actually ended up with the same roadblock then; I moved over to trying every available installation method, listed for clickable-ut on my Debian laptop, running into various errors, settling on a successful run with pipx; When running "clickable" in my QML package's directory It ends with the following error (running "clickable desktop" works fine):
[...]
Cleaning up.
Running command "launch"
Trying to kill the app before starting
Launching app
/bin/bash: lomiri-app-launch: command not found
I've temporarily bricked my Ubuntu tower when I tried install various Lomiri packages, one which augemented the kernel in way my machine doesn't like. But that's my fault, not something I expected to run into though.
Now that I'm back to this error, I did find a package on Debian for "lomiri-app-launch"; and once installed and rebooted, "which" can't find it in "/usr/lib/x86_64-linux-gnu". I don't know much about that folder, it shows as executable; but I added it to the path anyway; strangely "which" still can't find it, even after logout. I'm not even sure if it's looking for a package on my primary machine or on Ubuntu Touch but... Oh what a tangled web we weave.
Any help would be appreciated.