skeleton is obsolete and is not present in most recent distros. When installing on Debian 9 or 10 the given error reads:
Preparing to unpack Leap-2.3.1+31549-x64.deb ...
Failed to stop leapd.service: Unit leapd.service not loaded.
Unpacking leap (2.3.1+31549) over (2.3.1+31549) ...
Setting up leap (2.3.1+31549) ...
Leap Motion installed under /usr/bin and /usr/sbin
sed: can't read /etc/init.d/skeleton: No such file or directory
dpkg: error processing package leap (--install):
subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
I'd love to hear from Leap's team on this.