How do you install avconv on Ubuntu Server 13.04?

You can install avconv with package libav-tools

sudo apt-get install libav-tools

Unfortunately, those answer won't work on Bionic version because FFmpeg won't include the avahi libraries in the package. you will have to install libav-tools manually in order to get avconv_cli

sudo apt install ffmpeg  #requirement to run avahi
wget http://launchpadlibrarian.net/348889634/libav-tools_3.4.1-1_all.deb
sudo dpkg -i libav-tools_3.4.1-1_all.deb

I'm adding this answer here because this topic looks like the only one discusses the avconv but the answers are not for the later versions of Ubuntu distro. But why would you if you could get the same result from ffmpeg.

open your terminal and type as

sudo apt-get install ffmpeg libav-tools