Instructions

Replace your /etc/apt/sources.list contents to one of these sections

[Debian 11]

deb http://repo.iut.ac.ir/debian/ bullseye main

deb http://repo.iut.ac.ir/debian/ bullseye-updates main



[Debian 10]

deb http://repo.iut.ac.ir/debian/ buster main

deb http://repo.iut.ac.ir/debian/ buster-updates main



[Debian 9]

deb http://repo.iut.ac.ir/debian/ stretch main

deb http://repo.iut.ac.ir/debian/ stretch-updates main