How to downgrade Ubuntu 18.04 to 16.04?
2136
How to roll back Ubuntu to a previous version?
31506
How do I update Ubuntu manually?
121309
How to downgrade from El Capitan to Snow Leopard?
123413
Will apt-get dist-upgrade upgrade my system to a newer version?
151605
upgrading from 15.10 to 16.04 apt not installed
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
135547
Downgrading from OS X 10.9.2 to 10.9
5882
How to upgrade Ubuntu from an ISO image
63514
How do I decide what version of Ubuntu to install?
47002
How do I downgrade to Subversion 1.6?
119971
Install 17.10 on 32 bit machine
3612
Can I downgrade to Mavericks after installing Yosemite (beta/developer preview)?
21323
Where can I download the latest release of Ubuntu?
33807
Is there any safe way to remove GNOME Software in 16.04 and install the classic Ubuntu Software Center?
25919
How to replace an old version of Ubuntu with a newer one from USB/DVD?
100135
What does "upgrade to 18.04" mean?
151232
downgrading rails 4 to 3.2