Ubuntu/Linux Mint/Debian
sudo apt-get install aria2
CentOS/Fedora
sudo yum install aria2
Manjaro/Arch
sudo pacman -Sy aria2
关于是否要支持ed2k协议
作者的回答是：
Primary reason is because I'm not interested in ed2k. Don't get me wrong, but I'm busy for the other projects these days, and adding completely different protocol will not gonna happen from my side.
来源:https://github.com/aria2/aria2/issues/986#issuecomment-325183535