InternetBlackoutOnIranianServers.md

For Ubuntu 20.04

to change linux source repos

sed -i 's/http:\/\/[a-zA-Z0-9]*.[a-zA-Z0-9]*.*.com/http:\/\/ir.archive.ubuntu.com/g' /etc/apt/sources.list

or

sed -i 's/http:\/\/[a-zA-Z0-9]*.[a-zA-Z0-9]*.*.com/http:\/\/mirror.arvancloud.ir/g' /etc/apt/sources.list

apt update -y
apt upgrade -y

to set Ntp

sudo nano /etc/systemd/timesyncd.conf

[Time]
NTP=ntp.iranet.ir
FallbackNTP=ir.pool.ntp.org

sudo systemctl restart systemd-timesyncd
systemctl status systemd-timesyncd