snckrs@ubuntu:~$ sudo apt-get install vala-panel
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  vala-panel
0 upgraded, 1 newly installed, 0 to remove and 10 not upgraded.
Need to get 355 kB of archives.
After this operation, 2,413 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  vala-panel
Install these packages without verification? [y/N] y
Get:1 http://ppa.launchpad.net/josua-kollmann/ppa/ubuntu xenial/main amd64 vala-panel amd64 0.3.5-1 [355 kB]
Fetched 355 kB in 1s (237 kB/s)    
Selecting previously unselected package vala-panel.
(Reading database ... 264356 files and directories currently installed.)
Preparing to unpack .../vala-panel_0.3.5-1_amd64.deb ...
Unpacking vala-panel (0.3.5-1) ...
Processing triggers for libc-bin (2.23-0ubuntu3) ...
Processing triggers for hicolor-icon-theme (0.15-0ubuntu1) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for libglib2.0-0:amd64 (2.48.0-1ubuntu4) ...
Setting up vala-panel (0.3.5-1) ...
Processing triggers for libc-bin (2.23-0ubuntu3) ...
snckrs@ubuntu:~$