[Can't install sync on Ubuntu 19.4]

I guess you meant Ubuntu 19.04. There is no 19.4 yet. 😉

For Ubuntu 19.04 there is already an entry: 

 

 

[[SOLVED] Ubuntu 19.04 Problem]

Same issue here. Just tried to install resilio-sync (2.6.1-1) on ubuntu MATE 19.04.

$ systemctl status resilio-sync.service

● resilio-sync.service - Resilio Sync service

   Loaded: loaded (/lib/systemd/system/resilio-sync.service; enabled; vendor pre

   Active: activating (start) since Thu 2019-04-25 20:22:47 CEST; 35s ago

     Docs: https://help.resilio.com

    Tasks: 15 (limit: 4915)

   Memory: 4.2M

   CGroup: /system.slice/resilio-sync.service

           └─5204 /usr/bin/rslsync --config /etc/resilio-sync/config.json

 

Apr 25 20:22:47 pocket systemd[1]: Starting Resilio Sync service...

Apr 25 20:22:47 pocket systemd[1]: resilio-sync.service: Can't open PID file