I would like to know if it's safe to install Ubuntu 16.04 (safe as in stable, unlike 15*). If it's stable, is it possible to upgrade directly to 16.04 from 14.04 without carrying out a clean installation?
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It depends on what you mean by stable. The standard policy in Ubuntu is to offer the upgrade when the new LTS reaches .1, i.e., 16.04.1.
I upgraded my 14.04 in several machines, and I can signal these problems:
on a wide range of machines with intel graphics, you have a bad tearing of the screen, fixable by installing Yakkety kernels;
on several machines, suspend freeze the system;
in some flavors (xubuntu, mate) the cursor disappears after a lock (fixed by switching to a virtual console and back);
Bluetooth audio sink with high quality (A2DP) stops working at least for some hardware;
So yes, you have to be ready for a bit of bumpy switch. On the other hand, I like 16.04; the system feels snappier than 14.04, and LibreOffice 5 is a big step forward.
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Multiple deployments over vast variety of hardware, so far very stable, no issues even with few PPA added.
Arup Roy Chowdhury
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Stable? Depends on how you define it. I have three workstations with it installed, I have been installing it as an AD-DC server, I have an issue with that, but only because I installed Samba manually. No crashes so far, and no major problems that were not caused by me, So stable, YES!!!
Unity more configurable for sure, better than the earlier versions.
One caveat: documentation, when you search for answers on it, you get a lot of older version answers, but as far as running stable.
Here is a link all about upgrading, and how to do it bt several methods.
