Question of availability of emulator of earlier version of Ubuntu

[Robert Heller]

At Sat, 15 May 2021 13:11:30 +0100 "Ubuntu user technical support,? not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> On Sat, May 15, 2021 at 07:51:26PM +0800, Bret Busby wrote:
> > Hello.
> > 
> > An emulator; wine, is available for emulating (maybe only earlier
> > version(s) of) MS Windows, to provide for running applications that
> > run on only MS Windows, to run on Linux.
> > 
> > My wife has a computer that has Ubuntu 12.04 installed on it.
> > 
> > She will not upgrade the operating system, because she has an
> > application on it, that runs on 12.04, and not on later versions.
> > 
> > So, I am wondering whether an emulator is available, for 20.04, or,
> > better, for 21.04, that will emulate 12.04, to allow applications that
> > will not run on versions later than 12.04, to run on it.
> > 
> Virtualbox?

Or Libvirt, QEMU, etc.  Virtualbox might be the "easy pointy clicky" option.  
Libvirt/QEMU is my preference.

> 

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