EdgeRouter install/update nano

set system package repository stretch components 'main contrib non-free'
set system package repository stretch distribution stretch
set system package repository stretch url http://http.us.debian.org/debian

Do apt-get update, but don’t do apt-get upgrade, as it will break some of the packages the ER depends on.

https://help.ui.com/hc/en-us/articles/205202560-EdgeRouter-Add-Debian-Packages-to-EdgeOS
https://community.ui.com/questions/Install-Nano/40e7697a-404b-4083-b901-dbedbfdc8a8c