Issue
I failed to find the package when I want to install libdlib-dev.I have run apt update and I also change the server.Both of them don't work.My system is ubuntu 14.04.
href="https://i.stack.imgur.com/EGei2.png" rel="nofollow noreferrer">apt failed info
Solution
The package libdlib-dev isn't available for Ubutnu 14.04.It is only available for xenial, artful, bionic and cosmic.
Answered By - GAD3R Answer Checked By - Willingham (WPSolving Volunteer)