Ubuntu Release ISO's
https://ubuntu-releases.hbcse.tifr.res.in/
Add following lines to /etc/apt/sources.list for upgrades
Ubuntu 22.04 (jammy)
deb http://ubuntu.hbcse.tifr.res.in/ubuntu/ jammy main
deb-src http://ubuntu.hbcse.tifr.res.in/ubuntu/ jammy main
Ubuntu 21.04 (Hirsute Hippo)
deb http://ubuntu.hbcse.tifr.res.in/ubuntu/ hirsute main
deb-src http://ubuntu.hbcse.tifr.res.in/ubuntu/ hirsute main
Ubuntu 20.04.2 LTS (Focal Fossa)
deb http://ubuntu.hbcse.tifr.res.in/ubuntu/ focal main
deb-src http://ubuntu.hbcse.tifr.res.in/ubuntu/ focal main
Ubuntu 18.04.5 LTS (Bionic Beaver)
deb http://ubuntu.hbcse.tifr.res.in/ubuntu/ bionic main
deb-src http://ubuntu.hbcse.tifr.res.in/ubuntu/ bionic main
Official link: https://launchpad.net/ubuntu/+mirror/ubuntu.hbcse.tifr.res.in-archive
