Where to force Catalina upgrade and not Big sur upgrade from Mojave?
4309
How can I download an older version of OS X/macOS?
140850
Why does do-release-upgrade on Xubuntu running version 18.04 not offer to update to 20.04.1?
91274
How critical are macOS Mojave compatibility requirements?
68614
Is it possible to install an old version of Mac OS on a new Mac?
97346
Is it possible to skip releases during an upgrade?
123413
Will apt-get dist-upgrade upgrade my system to a newer version?
146391
Is there a way to enforce a deployment order in tom 7 and tom6 ?
109624
How do I tell apt to never upgrade a particular package?
50810
No upgrade available for 19.04 from 18.10
64558
What does `do-release-upgrade` really do?
155866
How to remove annoying iCloud nagging in Catalina?
144507
No facility exists in Update Manager to upgrade to a new version, why?
100494
Update Manager asking me to update kernel but apt-get upgrade does not?
101714
Is there any way to roll back the most recent upgrade?
16578
How to upgrade a single package using apt-get?
24165
Upgrade to version newer than repositories
109386
How do I create El Capitan installer on a Catalina (or post-El Capitan) installed Mac for use on USB boot installer