Unable to install "quickly" on Ubuntu GNOME 15.10
Solution 1:
There is no release of quickly package in Ubuntu 15.10. You can see here: https://launchpad.net/ubuntu/wily/+source/quickly Try any other version of Ubuntu.
Solution 2:
There are no quickly or quickly-ubuntu-template packages in Ubuntu 16.04.
An alternative software to Quickly is Illumination Software Creator. Version 6 of this software (the latest version) is released as a Debian package under a GPLv2 license. Illumination Software Creator allows you to easily create apps using a drag and drop interface and export it to multiple platforms.