Disable Upgrade to El Capitan
50863
Disable App Update Notifications on OSX?
77596
How delete an application that is bundled with macOS?
62503
New Macbook Pro - remove "high sierra", install "sierra"
148808
Update from Mac OS X 10.6.8 to the newest version
15687
How do I resume a release upgrade?
149582
how to *completely* turn off automatic updates in Windows 10
101714
Is there any way to roll back the most recent upgrade?
4474
Stopping all automatic updates Windows 10
34371
Can I force an iPhone user to upgrade an application?
121309
How to downgrade from El Capitan to Snow Leopard?
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
108620
Remove Update Notification (for all users except ADMIN)
35243
Is it safe to do-release-upgrade from 12.04.4 to 14.04.1?
109624
How do I tell apt to never upgrade a particular package?
1520
How to install software or upgrade from an old unsupported release?
116035
Interrupting apt-get dist-upgrade: what could happen?
23096
How to remove obsolete packages after failed release upgrade via do-release-upgrade on Ubuntu?