How to double the bit depth of linux?

Question

Debian

The machine is running 32 bit ubuntu 16.04. The axis was put many years ago and updated.
Now there is a need to run applications that have only a 64-bit version.
It is not sporting to completely rearrange the system. I want to update only the core and the minimum harness. Leave the rest at 32 bit. In addition to jokes about a trolleybus from a loaf, how can this be done?

Answer 1

Technically, you can start booting from a 64-bit kernel, you can go on and on with other garbage.
But it doesn't have to be.
apt-clone to clone all installed packages, save /home and /etc, see what else we have there (DBMS databases, etc.). And then a clean system, apt-clone to restore the packages and put everything back in place.

Answer 2

It's unsportsmanlike to rearrange Windows, but there shouldn't be any problems with Linux, unless, of course, you have set any of the sorts using the "configure-make-install" method.